Grandstream Networks Network Card HT503 FXS FXO User Manual

Grandstream Networks, Inc.  
HT503  
FXS/FXO Port  
Analog Telephone Adaptor  
HT503 User Manual  
Firmware Version 1.0.0.6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE OF FIGURES  
HT503 USER MANUAL  
TABLE OF TABLES  
HT503 USER MANUAL  
TABLE OF GUI INTERFACES  
HT503 USER MANUAL  
1. SCREENSHOT OF CONFIGURATION LOGIN PAGE  
2. STATUS CONFIGURATION PAGE DEFINITIONS  
3. SCREENSHOT OF BASIC SETTINGS CONFIGURATION PAGE  
4. SCREENSHOT OF ADVANCED SETTINGS CONFIGURATION PAGE  
5. SCREENSHOT OF FXS ACCOUNT CONFIGURATION  
6. SCREENSHOT OF FXO ACCOUNT CONFIGURATION  
7. SCREENSHOT OF CALL PROGRESS TONES CONFIGURATION PAGE  
8. SCREENSHOT OF SAVED CONFIGURATION CHANGES  
9. SCREENSHOT OF REBOOT PAGE  
Grandstream Networks, Inc.  
HT503 User Manual  
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Firmware 1.0.0.6  
Last Updated: 6/2007  
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WELCOME  
Thank you for purchasing Grandstream’s HT503, the affordable, feature rich, Analog Telephone  
Adaptor/IAD. The HT503 combines a sleek design with the latest technology to offer more advanced  
telephony features and significantly better integrated router performance than its predecessor – the  
HT488. It is the second ATA/IAD in the HandyTone 50x series. The HT503 functions as a true 3-in-1  
gateway for PSTN network, analog telephone FXS interface and IP network. It enables remote call  
origination and termination from/to PSTN and supports the feature of “hop-on/hop-off” calling.  
This manual will help you learn how to operate and manage your HT503 Analog Telephone Adaptor/IAD  
and make the best use of its many upgraded features including simple and quick installation, 3-way  
conferencing, and remote call origination and “hop-on/hop-off” calling using the programmable PSTN  
FXO port. This HT503 is very easy to manage and configure, and is specifically designed to be an easy  
to use and affordable VoIP solution for both the residential user and the remote user.  
This document is subject to changes without notice. The latest electronic version of this user manual can  
be downloaded from the following location: http://www.grandstream.com/resources.html  
SAFETY COMPLIANCES  
The HT503 adaptor complies with FCC/CE and various safety standards. The HT503 power adaptor is  
compliant with UL standard. Only use the universal power adapter provided with the HT503 package.  
The manufacturer’s warranty does not cover damages to the phone caused by unsupported power  
adaptors.  
WARRANTY  
If you purchased your HT503 from a reseller, please contact them for replacement, repair or refund. If  
you purchased the product directly from Grandstream, contact your Grandstream Sales and Service  
Representative for a RMA (Return Materials Authorization) number before you return the product.  
Grandstream reserves the right to remedy warranty policy without prior notification.  
Caution: Changes or modifications to this product not expressly approved by Grandstream, or operation  
of this product in any way other than as detailed by this User Manual, could void your manufacturer  
warranty.  
This document is contains links to Grandstream GUI Interfaces. Please remember to download these  
This document is subject to change without notice. The latest electronic version of this user manual is  
available for download from the following location:  
Reproduction or transmittal of the entire or any part, in any form or by any means, electronic or print,  
for any purpose without the express written permission of Grandstream Networks, Inc. is not  
permitted.  
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INSTALLATION  
EQUIPMENT PACKAGING  
The HT503 ATA package contains:  
One HT503 Main Case  
One Universal Power Adaptor  
One Ethernet Cable  
One HT503 Vertical Stand  
CONNECTING YOUR ATA  
The HT503 Analog Telephone Adaptor is an all-in-one VoIP integrated device designed to be a total  
solution for networks providing VoIP services. The HT503 VoIP features and functions are available  
using a regular analog telephone.  
FIGURE 1: CONNECTING THE HT503  
HT503  
HT503  
Back View  
Front View  
RJ-45 Ports  
10/100 Mbps  
Display LEDs  
(Green)  
Power  
Supply  
(12V)  
Reset  
RJ11  
RJ11  
FXS Port FXO Port  
The HT503 has one FXS port and one FXO port. The PHONE port next to the power supply is an FXS  
port. The LINE port on the back right of the HT503 is an FXO port. Both the FXS port and the FXO port  
can have a separate SIP account. This is a key feature of HT503 as it supports simultaneous calls on  
both the FXS port and FXO port. Telephone calls can be originated from or terminated on the PSTN  
network remotely via the FXO port.  
TABLE 1: DEFINITIONS OF THE HT503 CONNECTORS  
12VDC, 0.5A  
Power adapter connection  
LAN Port (RJ-45)  
WAN Port (RJ-45)  
PHONE (RJ-11)  
LINE (RJ-11)  
Connect the LAN port with an Ethernet cable to your PC.  
Connect to the internal LAN network or router.  
FXS port to be connected to analog phones / fax machines.  
FXO port should be connected to the PSTN line  
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FIVE EASY STEPS TO INSTALL THE HT503  
The HT503 is designed for easy configuration and easy installation. Configure the HT503 following the  
directions in the Configuration section of this manual.  
1. Connect a standard touch-tone analog telephone to the PHONE port.  
2. Insert a standard RJ11 telephone cable into the LINE port and connect the other end of the  
telephone cable to a wall jack.  
3. Insert the Ethernet cable into the WAN port of HT503 and connect the other end of the Ethernet  
cable to an uplink port (a router or a modem, etc.)  
4. Connect a PC to the LAN port of HT503 if it is being used as a router.  
5. Insert the power adapter into the HT503 and connect it to a wall outlet.  
FIGURE 2: INTERCONNECTION DIAGRAM OF THE HT503  
Internet ADSL/Cable  
Modem Ethernet  
Analog Phone  
WAN  
FXO  
FXS  
PSTN  
Cloud  
Cordless  
LAN  
Fax  
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PRODUCT OVERVIEW  
The HT503 is an affordable, high-quality, integrated IP telephony solution for both the residential  
customers and the ‘road-warriors’ who need advanced call features between traditional PSTN network  
and IP network. The HT503 enables IP connectivity for any phone or fax using the FXS port and a web-  
based GUI for easy configuration and installation. It functions as a true FXO gateway that enables remote  
call origination and termination from/to PSTN and supports the feature of “hop-on/hop-off” using the  
programmable FXO port.  
The HT503 features 2 SIP account profiles and supports advanced telephony features including caller ID,  
call waiting, call transfer, 3-way conferencing (with either IP or PSTN calls), and multi-language voice  
prompts. From a technical standpoint, the HT503 offers a power-outage survivable life line and internet-  
disconnect survivable fail-over-to-PSTN support, dual 10/100Mbps Ethernet ports with integrated high-  
performance NAT router, a flexible dial plan and a broad range of popular voice codecs.  
TABLE 2: HT503 TECHNICAL SPECIFICATIONS  
Interfaces  
1 FXS telephone port (RJ11, 1 FXO PSTN line port (RJ11) with lifeline support  
Two (2) 10M/100 Mbps ports (RJ45) with integrated Nat router  
Protocol Support  
TCP/UDP/IP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP,  
PPPoE, STUN & TELNET protocols  
LED Indicators  
Power, WAN, LAN, PHONE, and LINE  
Factory Reset Button  
RESET Button  
Device Management  
Web interface or via secure (AES encrypted) central configuration file for mass  
deployment  
Support device configuration via built-in IVR, Web browser or central configuration file  
through TFTP or HTTP  
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS)  
Auto/manual provisioning system  
NAT-friendly remote software upgrade (via TFTP/HTTP) for deployed devices including  
behind firewall/NAT  
Syslog support  
Yes  
DHCP Server/Client  
Audio Features  
Advanced Digital Signal Processing (DSP)  
Dynamic negotiation of codec and voice payload length  
Support for G.723.1A, G.729A/B/E, G.711, G.726-40/24/16, iLBC, T.38 codecs  
In-band and out-of-band DTMF ((in audio, RFC2833, SIP INFO)  
Silence Suppression, VAD (voice activity detection), CNG (comfort noise generation),  
ANG (automatic gain control)  
Adaptive jitter buffer control  
Packet delay & loss concealment (PLC) & G.168 compliant Line Echo Cancellation  
Support volume amplification  
Support configurable Call Progress Tones  
Call Handling Features  
Caller ID display or block, Call waiting caller ID, Call waiting/flash, Call transfer, hold,  
call forward, do not disturb, 3-way conferencing  
Network and  
Provisioning  
Manual or dynamic host configuration protocol (DHCP) network setup; RTP and NAT  
support traversal via STUN  
Fax over IP  
T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax  
Pass-through (pending), Fax Data pump V.17, V.19, V.27ter, V.29 for T.38 fax relay  
Security  
DIGEST authentication and encryption using MD5 and MD5-sess  
Physical Design  
Stylish and compact design; small universal power supply, ideal for travel  
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HARDWARE SPECIFICATION  
The table below lists the hardware specification of HT503.  
TABLE 3: HT503 HARDWARE SPECIFICATION  
LAN interface  
1xRJ45 10/100 Mbps Port  
1xRJ45 10/100 Mbps Port  
1 x FXS (RJ11)  
WAN interface  
FXS telephone port  
FXO telephone port (PSTN Port) 1x PSTN pass-through and life line port  
LED  
Power, WAN, LAN, PHONE, and LINE (Green)  
Input: 100–240 VAC, 50-60 Hz  
Output: 12VDC, 0.5A, UL certified  
Universal Switching  
Power Adaptor  
Dimension  
25mm x 115mm x 75mm (when laying flat);  
115mm x 25mm x 75mm (standing up)  
Weight  
Approximately 0.6lbs (0.3kg)  
Operational: 32° - 104°F or 5° – 45°C  
Storage: 10°–130°F  
Temperature  
Humidity  
10% - 90%  
(non-condensing)  
Compliance  
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BASIC OPERATIONS  
GET FAMILIAR WITH VOICE PROMPT  
HT503 has a stored voice prompt menu for quick browsing and simple configuration. Currently, the voice  
prompt menu is designed for the FXS port only. Dial “***” from the analog phone to enter the voice  
prompt.  
TABLE 4: HT503 IVR MENU DEFINITIONS  
Menu  
Voice Prompt  
Options  
Main Menu  
“Enter a Menu Option”  
Press “*” for the next menu option  
Press “#” to return to the main menu  
Enter 01-05, 07,12-17,47 or 99 menu options  
01  
“DHCP Mode”,  
“Static IP Mode”  
Press “9” to toggle the selection  
If using “Static IP Mode”, configure the IP address information using  
menus 02 to 05.  
If using “Dynamic IP Mode”, all IP address information comes from  
the DHCP server automatically after reboot.  
02  
“IP Address “ + IP address  
The current WAN IP address is announced  
If using “Static IP Mode”, enter 12 digit new IP address.  
03  
04  
“Subnet “ + IP address  
“Gateway “ + IP address  
Same as menu 02  
Same as menu 02  
05  
07  
“DNS Server “ + IP address  
Preferred Vocoder  
Same as menu 02  
Press “9” to move to the next selection in the list:  
PCM U / PCM A  
G.723  
G.729  
G.726  
iLBC  
12  
13  
WAN Port Web Access  
Press “9” to toggle between enable / disable  
Firmware Server IP Address  
Announces current Firmware Server IP address. Enter 12 digit new  
IP address.  
14  
15  
Configuration Server IP  
Address  
Announces current Config Server Path IP address. Enter 12 digit  
new IP address.  
Upgrade Protocol  
Upgrade protocol for firmware and configuration update. Press “9”  
to toggle between TFTP / HTTP  
16  
17  
Firmware Version  
Firmware Upgrade  
Firmware version information.  
Firmware upgrade mode. Press “9” to toggle among the following  
three options:  
- always check  
- check when pre/suffix changes  
- never upgrade  
47  
99  
“Direct IP Calling”  
“RESET”  
Enter a 12 digit IP address to make a direct IP call, after dial tone.  
(See “Make a Direct IP Call”.)  
Press “9” to reboot the device; or  
Enter encoded MAC address to restore factory default setting (See  
Restoring Factory Settings”)  
“Invalid Entry”  
Automatically returns to main menu  
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NOTE:  
“*” shifts down to the next menu option  
“#” returns to the main menu  
“9” functions as the ENTER key in many cases to confirm an option  
All entered digit sequences have known lengths - 2 digits for menu option and 12 digits for IP  
address. For IP address, add 0 before the digits if the digits are less than 3 (like 192.168.0.26  
should be key in like 192168000026, no dot needed while input). Once all of the digits are  
collected, the input will be processed.  
Key entry can not be deleted but the phone may prompt error once it is detected  
PLACING PHONE CALLS  
CALLING PHONE OR EXTENSION NUMBERS  
There are currently two methods to make an extension number call:  
a) Dial the numbers directly and wait for 4 (default) seconds.  
b) Dial the numbers directly, and press # (assuming that “use # as dial key” is selected in the web  
configuration).  
EXAMPLES:  
To dial another extension on the same proxy, such as 1008, simply pick up the attached phone,  
dial 1008 and then press the # or wait for 4 seconds.  
To dial a PSTN number such as 6266667890, you may need a prefix number followed by the  
phone number. Please check with your VoIP service provider for this information. If your phone is  
assigned a PSTN-like number such as 6265556789, you will most likely follow the rule 1 + (the  
number) – 16266667890. Press # or wait for 4 seconds.  
DIRECT IP CALLS  
Direct IP calling allows two parties, that is, a HT with an analog phone and another VoIP Device, to talk to  
each other in an ad hoc fashion without a SIP proxy. This kind of VoIP calls can be made between two  
parties if:  
Both HT503 and other VoIP Device (i.e. another Handytone ATA or Budgetone SIP phone or  
other VoIP unit) have public IP addresses, or  
Both HT503 and other VoIP Device are on the same LAN using private IP addresses, or  
Both HT503 and other VoIP Device can be connected through a router using public or private IP  
addresses (with necessary port forwarding or DMZ).  
TO PLACE A DIRECT IP CALL:  
1. Pick up the analog phone (or use the speakerphone),  
2. Access the voice menu prompt by dial “***”  
3. Dial “47” to access the direct IP call menu  
4. At voice prompt “Direct IP Calling” and dial tone, enter a 12-digit target IP address to  
make a call.  
Destination ports can be specified by using “*4” (encoding for “:”) followed by the port number.  
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EXAMPLES:  
1. If the target IP address is 192.168.0.10, the dialing convention is  
Voice Prompt with option 47, then 192 168 000 010  
followed by pressing the “#” key if it is configured as a send key or wait for more than 5 seconds.  
2. If the target IP address/port is 192.168.1.20:5062, then the dialing convention would be:  
Voice Prompt with option 47, then 192168001020*45062  
followed by pressing the “#” key if it is configured as a send key or wait for 4 seconds.  
NOTE: When placing a direct IP call, the “Use Random Port” should be set to “NO”.  
CALL HOLD  
This function is applicable on the FXS port for VoIP calls only. While in conversation, pressing the “flash”  
button on the connected phone (if the phone has that button) places the remote end on hold. Pressing the  
“flash” button again releases the previously held party and the conversation can resume. If no “flash”  
button is available, then on-off hook quickly (hook flash) will do the same thing. You may lose the call if  
‘hook flash’ is not quick enough.  
CALL WAITING  
This function is applicable on FXS port for VoIP calls only. If the call waiting feature is enabled, the user  
will hear a special stutter tone if there is another call on the line. Press the flash button to place the  
current party on hold and switch to the other call. Pressing the flash button toggles between two active  
calls. The HT503 also provides CWCID (call waiting caller ID) information which includes caller ID  
information in addition to the special stutter tone. The analog phone must support this feature for it to  
work on the HT503. Both call waiting functions (call waiting and CWCID) are activated and deactivated  
from the configuration pages menu.  
CALL TRANSFER  
The HT503 supports both blind transfer and attended transfer.  
Blind Transfer  
This function is applicable using the FXS port for VoIP calls only. Assume that parties A and B are in  
conversation. Party A wants to Blind Transfer Party B to C:  
1. A presses FLASH on the analog phone to hear the dial tone.  
2. Then A dials *87, then dials C’s number, and then presses #  
3. A can hang up.  
NOTE: “Enable Call Feature” has to be set to “Yes” in web configuration page.  
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Three situations can follow the transfer:  
1. A quick confirmation tone (temporarily using the call waiting indication tone) followed by a  
dialtone. This indicates the transfer was successful (transferee has received a 200 OK from  
transfer target). A can either hang up or make another call.  
2. A quick busy tone followed by a restored call (on supported platforms only). This means the  
transferee has received a 4xx response for the INVITE and we will try to recover the call. The  
busy tone indicates the transfer has failed.  
3. Busy tone keeps playing. This means we have failed to receive the second NOTIFY from the  
transferee and the call has timed out.  
Note: this does not indicate the transfer has been successful, nor does it indicate the transfer has  
failed. When transferee is a client that does not support the second NOTIFY (such as our own  
earlier firmware), this situation occurs. In bad network scenarios, this could also happen,  
although the transfer may have been completed successfully.  
Attended Transfer  
This function is applicable on the FXS port for VoIP calls only. Assume that parties A and B are in  
conversation. Party A wants to Attend Transfer Party B to C:  
1. A presses FLASH on the analog phone to get a dial tone;  
2. A then dial C’s number followed by #.  
3. If C answers the call, A and C are in conversation. Then A can hang up to complete transfer.  
4. If C does not answer the call, A can press “flash” back to talk to B.  
NOTE: When Attended Transfer fails and A hangs up, the HT503 will ring user A back again to remind  
A that party B is still on the call. Party A can pick up the phone to resume a conversation with party B.  
3-WAY CONFERENCING  
The HT503 supports both Star Code Style and Bellcore Style 3-way conferencing.  
Star Code Style 3-way Conference  
This function is applicable on the FXS port for VoIP calls only. Assume that parties A and B are in  
conversation. Party A wants to bring C into a 3-way conference:  
1. A presses FLASH (on the analog phone, or Hook Flash for old model phones) to get a dial tone.  
2. A dials *23 then C’s number then # (or wait for 4 seconds).  
3. If C answers the call, then A presses FLASH to bring B, C in the conference.  
4. If C does not answer the call, A can press FLASH back to talk to B.  
5. If A presses FLASH during conference, C will be dropped out.  
NOTE: Enable Call Feature” has to be set to YES in FXS PORT in the web configuration page.  
Bellcore Style 3-way Conference  
To use the Bellcore Style conference, the “Use Bell-style 3-way Conference” field in FXS PORT web  
configuration must be enabled.  
Assume that parties A and B are in conversation. Party A (using the HT503) wants to bring C into a 3-  
way conference:  
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1. A presses FLASH (on the analog phone, or Hook Flash for old model phones) to get a dial  
tone.  
2. A dials C’s number then # (or wait for 4 seconds).  
3. If C answers the call, then A presses FLASH to bring B, C in the conference.  
4. If C does not answer the call, A can press FLASH back to talk to B.  
5. If A presses FLASH during the conference, C will be dropped out.  
Note: Party A is the call initiator for both calls with party B and party C.  
PSTN PASS THROUGH  
HT503 supports PSTN pass through using the FXS port. The user can place and receive PSTN calls  
when the FXS port is in use.  
To receive PSTN calls, pick up the phone when it rings;  
To complete a PSTN call, press the PSTN access code (*00 is default, or any number configured  
in the web configuration) to switch to the PSTN line, listen for a dial tone, then dial the number.  
It the HT503 loses power, it will function as a jack, enabling a direct connection to the PSTN Line.  
VOIP-TO-PSTN CALLS  
This function is available using the FXO port. The FXO port functions as a bridge between the Internet  
and PSTN. The user can remotely use a PSTN line to initiate a call.  
TO MAKE A VOIP-TO-PSTN CALL:  
1. Dial the FXO SIP account phone number to establish the VoIP session. The caller will hear the  
ring back tone once. Then the caller hears either a special continuous tone or a dial tone. The  
special continuous tone is played if the pin code is configured, otherwise, the caller will hear a dial  
tone.  
2. Enter the pin code (configured on the configuration page). The caller will hear a dial tone and be  
connected to the PSTN line if the pin code is valid. If the pin code is invalid, the continuous tone  
is played to prompt caller to enter the pin code again. The user may try up to 3 times to enter a  
correct pin code. After three (3) tries, the HT503 hangs up.  
3. After the caller hears a dial tone from PSTN line, the caller can place the next call.  
4. The user can hit the # key to identify the end of the pin code or wait 4 seconds for a new dial tone  
and then dialing the PSTN number.  
Note:  
Users can choose whether or not to apply password protection for VoIP-to-PSTN calls. A PIN  
(Pin for PSTN calls) consists of up to 8 numeric digits and can be configured using the BASIC  
SETTINGS of the web configuration page. By default, there is no password protection. (I.e. there  
is no authentication required for callers on the use of PSTN line through HT503).  
When a PIN is configured for VOIP-to-PSTN call flow, the VoIP device that calls into the HT503  
FXO account needs to configure RFC2833 or SIP Info for DTMF digit transmission.  
The special continuous tone is the prompt to enter a valid PIN code. If a caller doesn’t enter a  
valid PIN, the HT503 times out after 10 seconds. Users may press the “#” key to indicate the end  
of an input or wait 4 seconds.  
On the web configuration page, if the “Forward to PSTN” is configured, the second stage dialing  
format is eliminated, so after dialing into the FXO SIP account number, the PSTN number will be  
called automatically  
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PSTN-TO-VOIP CALLS  
This function is available using the FXO port. The FXO port functions as a bridge between the Internet  
and PSTN and enables calls to be passed from the PSTN network to VoIP. The user can make VoIP calls  
remotely by dialing into the FXO line port on HT503.  
TO MAKE A PSTN-TO-VOIP CALL:  
1. Make an incoming call to the PSTN line on FXO port. The phone will ring for 4 times by default  
(this setting is configurable on the configuration page).  
2. If no one answers the call after 4 rings (default configuration), then the caller hears either a  
special continuous tone (prompting a PIN number) or a dial tone.  
3. Enter a valid PIN. The caller will hear dial tone and be bridged to VoIP. If an incorrect PIN is  
input, the continuous tone prompts caller to enter a valid PIN. The caller may try 3 times to enter  
a valid PIN, if it is invalid the HT503 will hang up.  
4. The caller can dial a VoIP number followed by # (or wait for 4 seconds); the VoIP call will be  
initiated from the SIP account configured on the FXO port.  
NOTE:  
Users can choose whether or not to apply password protection for VoIP-to-PSTN calls. A PIN  
(Pin for PSTN calls) consists of up to 8 numeric digits and can be configured using the BASIC  
SETTINGS of the web configuration page. By default, there is no password protection. (I.e. there  
is no authentication required for callers on the use of PSTN line through HT503).  
When a PIN is configured for VOIP-to-PSTN call flow, the VoIP device that calls into the HT503  
FXO account needs to configure RFC2833 or SIP Info for DTMF digit transmission.  
The special continuous tone is the prompt to enter a valid PIN code. If a caller doesn’t enter a  
valid PIN, the HT503 times out after 10 seconds. Users may press the “#” key to indicate the end  
of an input or wait 4 seconds.  
On the web configuration page, if the “Forward to VoIP” is configured, the second stage dialing  
format is eliminated, so after dialing into the FXO SIP account number, the PSTN number will be  
called automatically  
ROUTE CALLS TO PSTN  
The FXO port enables access to the PSTN network. By default, the HT503 is in VoIP mode at off-hook.  
If “Route call to PSTN” is configured, certain calls will be initiated from the FXO PSTN line port. This call  
feature is especially useful for emergency calls or local telephone calls.  
To use this feature, users need to specify a prefix or a telephone number in the “Route call to PSTN” in  
the BASIC SETTINGS web configuration page. If the dialed digits match the specified prefix, outbound  
calls will be initiated from PSTN line.  
Note: The route to PSTN feature is only applicable to a phone connected to the FXS Port. The  
configuration is done using the “dial plan” feature under the FXS tab. An example of the configuration is  
{L: 911x+} This shows that only calls that start with 911 are immediately forwarded to the PSTN line. All  
other numbers will not be routed to the PSTN. An normal # would be: {L: 617x+|x+} or {x+| L: 617x+}  
For example, if “Route call to PSTN” is configured as 626, all outgoing calls starting with 626 will be  
initiated from the PSTN line.  
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FORWARD CALLS TO PSTN  
Any VOIP call may be forwarded to a specified PSTN number if the call is not answered after a pre  
configured numbers of rings. By default “Number of Rings” parameter has value 4.  
For example, if the end-user has configured a cell phone number in the field “Forward to PSTN” under  
BASIC SETTINGS configuration page, all calls will be forwarded to the cell phone number after 4 rings.  
FORWARD CALLS TO VOIP  
By default, each incoming PSTN call is received over the FXS port. The end-user may forward such a  
call to any preconfigured VoIP extension, in case the call is not answered in a certain number of rings.  
The Default value of the parameter “Number of Rings” is 4. If during 4 rings, the incoming from the PSTN  
call is not answered, the call will be forwarded to another VoIP number previously configured in the  
field:”Forward to VoIP”. This parameter can also be found under BASIC SETTINGS configuration page.  
ONE STAGE DIALING  
This feature is applicable for VoIP to PSTN calls. Any VoIP extension may dial directly to a local PSTN  
number if the one-stage dialing feature is activated. This feature is configured under the FXO  
Configuration page and requires SIP Server configuration and support. The special dial plan feature must  
be activated in the SIP Server. An outbound call will be sent directly to the assigned FXO port account,  
where there the HT503 will initiate a call to the local CO. The RequestURI header in the INVITE  
message contains the phone number used to initiate the call to the local CO.  
FAX SUPPORT  
HT503 supports FAX in two modes: 1) T.38 (Fax over IP) and 2) fax pass through. T.38 is the preferred  
method because it is more reliable and works well in most network conditions. If the service provider  
supports T.38, please use this method by selecting Fax mode to be T.38 (default). If the service provider  
does not support T.38, pass-through mode may be used. To send or receive faxes in fax pass through  
mode, users must select all the Preferred Codecs to be PCMU/PCMA (G.711-u/a).  
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CALL FEATURES  
TABLE 5: HT503 CALL FEATURE DEFINITIONS  
Key  
Call Features  
*30  
Block Caller ID (for all subsequent calls)  
*31  
*47  
Send Caller ID (for all subsequent calls)  
Direct IP Calling. Dial “*47” + “IP address”. No dial tone is played in the middle. Detail see Direct  
IP Calling section on page 12.  
*50  
*51  
*67  
*82  
Disable Call Waiting (for all subsequent calls)  
Enable Call Waiting (for all subsequent calls)  
Block Caller ID (per call). Dial “*67” + ” number ”. No dial tone is played in the middle.  
Send Caller ID (per call). Dial “*82” + ” number ”. No dial tone is played in the middle.  
*69  
*70  
*71  
*72  
Call Return Service: Dial *69 and the phone will dial the last incoming phone number received.  
Disable Call Waiting (per call). Dial “*70” + ” number ”. No dial tone is played in the middle.  
Enable Call Waiting (per call). Dial “*71” + ” number ”. No dial tone is played in the middle.  
Unconditional Call Forward: Dial “*72” and then the forwarding number followed by “#”. Wait for  
dial tone and hang up. (dial tone indicates successful forward)  
*73  
Cancel Unconditional Call Forward. To cancel “Unconditional Call Forward”, dial “*73”, wait for  
dial tone, then hang up.  
*78  
Enable Do Not Disturb (DND): When enabled all incoming calls are rejected.  
*79  
*87  
*90  
Disable Do Not Disturb (DND): When disabled, incoming calls are accepted.  
Blind Transfer  
Busy Call Forward: Dial “*90” and then the forwarding number followed by “#”. Wait for dial tone  
then hang up.  
*91  
Cancel Busy Call Forward. To cancel “Busy Call Forward”, dial “*91”, wait for dial tone, then  
hang up.  
*92  
Delayed Call Forward. Dial “*92” and then the forwarding number followed by “#”. Wait for dial  
tone then hang up.  
*93  
Cancel Delayed Call Forward. To cancel Delayed Call Forward, dial “*93”, wait for dial tone,  
then hang up.  
Flash/Hook  
Toggles between active call and incoming call (call waiting tone). If not in conversation, flash/hook  
will switch to a new channel for a new call.  
#
Pressing pound sign will serve as Re-Dial key.  
LED Light Pattern Indication  
TABLE 6: HT503 LED DEFINITIONS  
LEDs  
POWER LED  
WAN LED  
Indicates Power. Remains ON when power is connected  
Indicates LAN (or WAN) port activity  
LAN LED  
Indicates PC (or LAN) port activity  
PHONE/ LINE LED  
Indicates the status of the FXS port and FXO ports on the  
back panel.  
Busy – ON (Solid Green) Available – OFF  
Slow blinking FXS LEDs indicates voicemail for that port.  
Note: Slow blinking of POWER, WAN, and LAN LEDs together indicate firmware upgrade/provisioning state.  
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CONFIGURATION GUIDE  
CONFIGURING HT503 THROUGH VOICE PROMPT  
DHCP MODE  
Follow Table 3 with voice menu option 01 to enable HT503 to use DHCP.  
STATIC IP MODE  
Follow Table 3 with voice menu option 01 to enable HT503 to use STATIC IP mode, then use option 02,  
03, 04 to set up HT503’s IP, Subnet Mask, Gateway respectively.  
TFTP SERVER ADDRESS  
Follow Table 3 with voice menu option 06 to configure the IP address of the TFTP server.  
FIRMWARE SERVER IP ADDRESS  
Select voice menu option 13 to configure the IP address of the firmware server.  
CONFIGURATION SERVER IP ADDRESS  
Select voice menu option 14 to configure the IP address of the configuration server.  
UPGRADE PROTOCOL  
Select voice menu option 15 to choose firmware and configuration upgrade protocol. User can choose  
between TFTP and HTTP.  
FIRMWARE UPGRADE MODE  
Select voice menu option 17 to choose firmware upgrade mode. There are three options:  
1) always check, 2) check when pre/suffix changes, and 3) never upgrade  
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CONFIGURING HT503 WITH WEB BROWSER  
HT503 ATA has an embedded Web server that will respond to HTTP GET/POST requests. It also has  
embedded HTML pages that allow users to configure the HT503 through a Web browser such as  
Microsoft’s IE, AOL’s Netscape or Mozilla Firefox installed on Windows or Unix OS. (Macintosh OS is not  
included).  
Access the Web Configuration Menu  
The HT503 HTML configuration page can be accessed via LAN or WAN ports.  
FROM THE LAN PORT:  
1. Directly connect a computer to the LAN port  
2. Open a command window on the computer  
3. Type in “ipconfig /release”, the IP address etc becomes 0  
4. Type in “ipconfig /renew”, the computer gets an IP address in 192.168.2.x segment by  
default  
5. Open a web browser, type in the default IP address of the LAN port. http://192.168.2.1. You  
will see the log in page of the device.  
FROM THE WAN PORT:  
1. Follow table 4 to find the WAN side IP address.  
2. Open a web browser, type in the WAN side IP address – for example:  
Note:  
WAN side HTTP access is disabled by default for security reason. You can enable HTTP access  
on the configuration page by setting “WAN side HTTP access” to be YES.  
Initial access to the configuration pages is always from the LAN port. The instructions are listed  
above.  
The IVR announces 12 digits IP address, you need to strip out the leading “0” in the IP address.  
For ex. IP address: 192.168.001.014, you need to type in http://192.168.1.14 in the web browser.  
END USER CONFIGURATION  
Once the HTTP request is entered and sent from a web browser, the user will see a log-in screen. There  
are two default passwords for the login page:  
User Level:  
Password: Web pages allowed:  
End User Level  
Administrator Level  
123  
Only Status and Basic Settings  
Browse all pages  
admin  
Only an administrator can access the “ADVANCED SETTING” configuration page. Please reference the  
GUI pages using the following link: http://www.grandstream.com/user_manuals/GUI/GUI_HT503.rar.  
Once this HTTP request is entered and sent from a Web browser, the HT503 will respond with the  
following login screen:  
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FIGURE 3: SCREENSHOT OF CONFIGURATION LOG-IN PAGE  
The password is case sensitive with maximum length of 25 characters. The factory default password for  
End User and administrator is “123” and “admin” respectively. Only an administrator can access the  
“ADVANCED SETTING” configuration page.  
NOTE: If you can not log into the configuration page by using the default password, please check with  
the VoIP service provider. It is most likely the VoIP service provider has provisioned the device and  
configured for you therefore the password has already been changed.  
After a correct password is entered in the login screen, the embedded web server will respond with the  
Configuration pages which are explained in details below.  
TABLE 7: HT503 DEVICE STATUS PAGE DEFINITIONS  
MAC Address  
The device ID, in HEX format. This is very important ID for ISP troubleshooting.  
This field shows IP address of the HT503.  
WAN IP Address  
Product Model  
Software Version  
This field contains the product model info, such as HT503.  
Program: This is the main software release. This number is always used for firmware  
upgrade. Current release is 1.0.0.6  
Bootloader: current version is 1.0.0.7.  
Core: current version 1.0.0.14  
Base: current version is 1.0.0.5  
System Uptime  
PPPoE Link Up  
NAT  
This shows system up time since last reboot.  
This shows whether the PPPoE is up if connected to DSL modem  
This shows what kind NAT the HT503 is connected to. It is based on STUN protocol. If  
the detected NAT is symmetric NAT, STUN will not work and Outbound Proxy needed  
to make HT503 functioning correctly.  
Port Status  
Displays information regarding the individual FXS ports.  
Port  
Hook  
Registration  
DND  
Forward  
Busy  
Forward  
Delayed  
Forward  
FXS  
FXO  
On Hook  
On Hook  
Registered  
Registered  
Yes  
No  
613  
614  
Both FXS port and FXO port are registered with this SIP Server.  
FXS Port user has set Do Not Disturb.  
FXS Port user has set his calls to be forwarded unconditionally to ext 613.  
FXO Port user has set his calls to forward to 614 when his phone is busy.  
TABLE 8: HT503 BASIC SETTINGS PAGE DEFINITIONS  
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End User Password  
This contains the password for end user to access the Web Configuration Menu. User  
can put new password here. This field is case sensitive with maximum of 25 characters  
Web Port  
This is the device’s internal HTTP server port. Default is 80.  
Default is set to YES  
Telnet Server  
IP Address  
If DHCP mode is enabled, then all the field values for the Static IP mode are not  
used (even though they are still saved in the Flash memory.) The HT503 will acquire  
its IP address from DHCP in the network.  
PPPoE settings are usually for DSL/ADSL modem users. The HT503 will attempt to  
establish a PPPoE session if PPPoE account is set.  
If Static IP mode is selected, the IP address, Subnet Mask, Default Router IP  
address, DNS Server 1 (mandatory), DNS Server 2 (optional) fields need to be  
configured.  
DHCP hostname  
DHCP domain  
This option specifies the name of the client. This field is optional but may be required  
by some Internet Service Providers. Default is blank.  
This option specifies the domain name that client should use when resolving  
hostnames via the Domain Name System. Default is blank.  
DHCP vendor class ID  
PPPoE account ID  
This option is used by clients and servers to exchange vendor-specific information.  
Default is blank.  
PPPoE username. Necessary if your ISP requires you to use a PPPoE (Point to Point  
Protocol over Ethernet) connection  
PPPoE password  
PPPoE account password  
PPPoE Service name  
This field is optional. If your ISP uses a service name for the PPPoE connection, enter  
the service name here. Default is blank.  
Preferred DNS  
Time Zone  
The address of your preferred DNS server.  
This parameter controls how the displayed date/time will be adjusted according to the  
specified time zone.  
Self Defined Time Zone  
The syntax is: std offset dst [offset], start [/time], end [/time]  
Default is set to: MTZ+6MDT+5,M3.2.0,M11.1.0  
MTZ+6MDT+5,  
This indicates a time zone with 6 hours offset with 1 hour ahead which is U.S central  
time. If it is positive (+) if the local time zone is west of the Prime Meridian and  
negative (-) if it is east.  
Prime Meridian (A.K.A: International or Greenwich Meridian)  
M3.2.0,M11.1.0  
The 1st number indicates Month: 1,2,3.., 12 (for Jan, Feb, .., Dec)  
The 2nd number indicates the nth iteration of the weekday: (1st Sunday, 3rd Tuesday…)  
The 3rd number indicates weekday: 0,1,2,..,6( for Sun, Mon, Tues,..,Sat)  
Therefore, this example is the DST which starts from the second Sunday of March to  
the 1st Sunday of November.  
Language  
Languages supported with the voice prompt.  
Device Mode  
This parameter controls whether the device is working in NAT router mode or Bridge  
mode. Save the setting and reboot prior to configuring the HT503.  
NAT Maximum Ports  
NAT TCP Timeout  
The number of ports that can be managed while in NAT router mode.  
Range: 0 – 4096, default is 1024. Typically one port per connection.  
NAT TCP idle timeout in seconds. Connection will be closed after preconfigured,  
timeout if not refreshed.  
Range: 0 - 3600  
NAT UDP Timeout  
NAT TCP idle timeout in seconds. Connection will be closed after preconfigured,  
timeout if not refreshed.  
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Range: 0 – 3600, default is 300  
Uplink Bandwidth  
Downlink Bandwidth  
Enable UPnP  
The maximum uplink bandwidth permitted by the device. This function is disabled by  
default. The total bandwidth can be set as: 128K, 256K, 512K, 1M, 4M or 10M.  
For example if 64 is configured, there will be at least 64kbps reserved for VoIP. The  
primary function of this setting is to reserve bandwidth for VoIP.  
The maximum downlink bandwidth permitted by the device. This function is disabled  
by default. The total bandwidth can be set as: 128K, 256K, 512K, 1M, 4M or 10M.  
For example if 128 is configured, there will be at least 128kbps reserved for VoIP. The  
primary function of this setting is to reserve bandwidth for VoIP.  
When set to “Yes”, the HT503 acts as an UPnP gateway for your UPnP enabled  
applications. UPnP = “Universal Plug and Play”  
Reply to ICMP on WAN  
Port  
When set to “Yes”, the HT503 responds to the PING command from other computers,  
but is also made vulnerable to DOS attacks. Default is No.  
WAN Side HTTP/Telnet  
Access  
When set to “Yes”, the user can access the web configuration pages through the WAN  
port, instead of through the PC port. Warning: this configuration is less secure than the  
default option. Default is No.  
Cloned WAN MAC  
Address:  
This allows the user to change/set a specific MAC address on the WAN interface.  
Note: Set in Hex format  
LAN Subnet Mask  
LAN DHCP Base IP:  
DHCP IP Lease Time  
DMZ IP:  
Sets the LAN subnet mask. Default value is 255.255.255.0  
Base IP for the LAN port, which functions as default gateway for its LAN. Default value  
is 192.168.2.1  
The length of time the IP address is assigned to the LAN clients. Value is set in units of  
hours. Default value is 120 hrs (5 days).  
This function forwards all WAN IP traffic to a specific IP address if no matching port is  
used by HT503 or in the defined port forwarding.  
Port Forwarding:  
Allows users to forward a matching (TCP/UDP) port to a specific LAN IP address with a  
specific (TCP/UDP) port.  
PSTN access code  
PIN for PSTN calls  
PIN for VoIP calls  
Route Call to PSTN  
The code to access the PSTN line (Maximum 5 digits). Default is “*00”.  
PIN code to bridge from VoIP to PSTN (Maximum 8 digits, No Default)  
PIN code to bridge from PSTN to VoIP (Maximum 8 digits, No Default)  
If the dialed digits match one of the specified prefix here, outbound calls will be initiated  
from PSTN line. This field is especially useful for emergency calls.  
Unconditional Call  
Forward to PSTN  
Calls are unconditionally forwarded to the specified PSTN phone number for all  
incoming VoIP calls on FXO port.  
Unconditional Call  
Forward to VoIP  
Calls are unconditionally forwarded to the specified VoIP phone number for all  
incoming PSTN calls.  
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ADVANCED CONFIGURATION AND FXS/FXO PORTS PARAMETERS  
To login to the Advanced Setting and FXS port configuration pages, administrator password is required.  
The default administrator password is “admin”. User can change the administrator password here. The  
password is case sensitive and the maximum length is 25 characters.  
TABLE 9: HT503 ADVANCED SETTINGS PAGE DEFINITIONS  
Admin Password  
Administrator password. Only the administrator can configure the “Advanced Settings”  
page. Password field is purposely blanked for security reason after clicking update and  
saved. The maximum password length is 25 characters.  
Layer 3 QoS  
Layer 2 QoS  
This field defines the layer 3 QoS parameter which can be the value used for IP  
Precedence or Diff-Serv or MPLS. Default value is 48.  
Layer 2 QoS settings. Default setting is blank. VLAN supported equipment is required  
when configuring these settings.  
STUN Server  
IP address or Domain name of the STUN server.  
Keep-alive interval  
This parameter specifies how often the HT503 sends a blank UDP packet to the SIP  
server in order to keep the NAT “pin hole” open. Default is 20 seconds.  
Firmware Upgrade and  
Provisioning  
Enables the HT503 to download firmware or configuration files through either TFTP or  
HTTP servers. The default method is HTTP.  
Via TFTP Server  
This is the IP address of the configured TFTP server. If this is configured, the HT503  
retrieves the new configuration file or new code image from the specified TFTP server  
at boot time. After 5 attempts, the system will timeout and will start the boot process  
using the existing code image in the Flash memory. If a TFTP server is configured and  
a new code image is retrieved, the new downloaded image is saved into the Flash  
memory.  
Note: Firmware upgrades may take up to 10 minutes depending on your network  
environment. On a LAN it usually takes about 2 minutes. Please do NOT interrupt the  
TFTP upgrade process (especially the power supply) as this will damage the device.  
Depending on the network environment this process can take up to 15 or 20 minutes.  
Via HTTP Server  
The URL for the HTTP server used for firmware upgrade and configuration via HTTP.  
:6688” is the specific TCP port where the HTTP server is listening; Omit if using  
default port 80. Note: If Auto Upgrade is set to No, F/W will download at boot time.  
Firmware Server Path  
Config Server Path  
Firmware File Prefix  
IP address or domain name of firmware server.  
IP address or domain name of configuration server.  
Default is blank. If configured, HT503 will request the firmware file with the prefix. This  
setting is useful for ITSPs. End user should keep it blank.  
Firmware File Postfix  
Config File Prefix  
Default is blank. End users should keep it blank.  
Default is blank. End users should keep it blank.  
Default is blank. End users should keep it blank.  
Config File Postfix  
Automatic Upgrade  
Choose “Yes” to enable automatic upgrades and provisioning. In “check for new  
firmware every” field, enter the number of days to set the frequency in which the HT503  
will check the server for firmware or configuration upgrades. When set to “No” the  
HT503 will only upgrade at boot time. You can also have the HT503 check for updates  
only when the firmware file prefix/suffix changes. The Default is “Yes”.  
Authenticate Conf File  
Firmware Key  
This protects the configuration from an unauthorized change. If set to “Yes, the  
configuration file is authenticated before acceptance.  
Key for firmware encryption. (32 digits in hexadecimal format. End users should keep it  
blank.  
Call Progress Tones  
Using these settings, users can configure tone frequencies according to their  
preference. By default they are set to North American frequencies.  
These should be configured with known values to avoid uncomfortable high pitch  
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sounds. ON is the period of ringing (“On time” in ‘ms’) while OFF is the period of  
silence. In order to set a continuous tone, OFF should be zero. Otherwise it will ring ON  
ms and a pause of OFF ms and then repeat the pattern.  
Here is an example for the configuration of the dial tone for North America:  
f1=350@-13,f2=440@-13,c=0/0;  
Syntax: f1=freq@vol, f2=freq@vol, c=on1/off1-on2/off2-on3/off3; [...]  
(Note: freq: 0 - 4000Hz; vol: -30 - 0dBm)  
Lock Keypad Update  
Disable Voice Prompt  
Disable Direct IP Calling  
NTP server  
If set to “Yes”, the configuration update via keypad is disabled.  
Disables the voice prompt configuration. Default is “No.”  
Disables the Direct IP Call function. Default is “No.”  
URL or IP address of the NTP server, Used to synchronize the date/time.  
The IP address or URL of syslog server, especially useful for ITSP  
Syslog Server  
Syslog Level  
Select the ATA to report the log level. Default is NONE. The level is either one of  
DEBUG, INFO, WARNING or ERROR. Syslog messages are sent based on the  
following events:  
product model/version on boot up (INFO level)  
NAT related info (INFO level)  
sent or received SIP message (DEBUG level)  
SIP message summary (INFO level)  
inbound and outbound calls (INFO level)  
registration status change (INFO level)  
negotiated codec (INFO level)  
Ethernet link up (INFO level)  
SLIC chip exception (WARNING and ERROR levels)  
memory exception (ERROR level)  
The Syslog uses USER facility. In addition to standard Syslog payload, it contains the  
following components: GS_LOG: [device MAC address][error code] error message  
Ex. May 19 02:40:38 192.168.1.14 GS_LOG: [00:0b:82:00:a1:be][000] Ethernet link is up  
Download Device  
Configuration  
This is a special feature that enables the user to create a text file backup of your  
existing configuration.  
TABLE 10: HT503 FXS PORT SETTINGS PAGES DEFINITIONS  
Account Active  
SIP Server  
When set to yes the FXS port is activated.  
This field contains the URL string or the IP address (and port, if different from 5060) of  
the SIP proxy server. e.g., the following are some valid examples: sip.my-voip-  
provider.com, or sip:my-company-sip-server.com, or 192.168.1.200:5066  
IP address or Domain name of Outbound Proxy, or Media Gateway, or Session Border  
Controller. Used by ATA for firewall or NAT penetration in different network  
environment. If symmetric NAT is detected, STUN will not work and ONLY Outbound  
Proxy will work.  
Outbound Proxy  
SIP Transport  
User can select UDP or TCP or TLS.  
NAT Traversal (STUN)  
This setting decides whether the NAT traversal mechanism is activated. It should be  
set to “Yes” if the device is behind a NAT router. If no outbound proxy is configured, a  
STUN server needs to be set to activate STUN detection mechanism. Usually ITSP will  
provide these settings. If this field is set to “Yes”, then the device will periodically send  
a dummy UDP packet to the SIP server to pinhole the NAT.  
SIP User ID  
User account information, provided by VoIP service provider (ITSP), usually has the  
form of digit similar to phone number or actually a phone number. This field contains  
the user part of the SIP address for this phone. e.g., if the SIP address is  
sip:my_user_id@my_provider.com, then the SIP User ID is: my_user_id.  
Do NOT include the preceding “sip:” scheme or the host portion of the SIP address in  
this field.  
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Authenticate ID  
ID used for authentication, usually same as SIP user ID, but could be different and  
decided by ITSP.  
Authentication Password Password for ATA to register to (SIP) servers of ITSP. Purposely left blank once saved  
for security. Maximum length is 25.  
Name  
SIP service subscriber’s name which will be used for Caller ID display  
Use DNS SRV:  
User ID is Phone Number  
Default is No. If set to Yes the client will use DNS SRV to lookup for the SIP server.  
If “Yes” is set, a “user=phone” parameter will be attached to the “From” header in SIP  
request  
SIP Registration  
This parameter controls whether the HT503 needs to send REGISTER messages to  
the proxy server. The default setting is “Yes”.  
Unregister on Reboot  
Default is No. If set to yes, the device will first send registration request to remove all  
previous bindings. Use only if proxy supports this remove bindings request.  
Outgoing Call w/o  
Registration  
This parameter lets users place outgoing calls even when not registered (if allowed by  
ITSP) but it’s unable to receive incoming calls.  
Register Expiration  
This parameter allows the user to specify the time frequency (in minutes) the  
HandyTone ATA refreshes its registration with the specified registrar. The default  
interval is 60 minutes (or 1 hour). The maximum interval is 65535 minutes (about 45  
days).  
Local SIP port  
Local RTP port  
This parameter defines the local SIP port the HT503 will listen and transmit. The default  
value for FXS port is 5060.  
This parameter defines the local RTP-RTCP port pair the HandyTone ATA will listen  
and transmit. It is the base RTP port for channel 0. When configured, channel 0 will use  
this port _value for RTP and the port_value+1 for its RTCP; channel 1 will use  
port_value+2 for RTP and port_value+3 for its RTCP. The default value for FXS port is  
5004.  
Use Random Port  
Refer to Use Target  
Default No. If set to Yes, the device will pick randomly-generated SIP and RTP ports.  
This is usually necessary when multiple HandyTone ATAs are behind the same NAT.  
Default is No. If set to “Yes”, then for Attended Transfer, the “Refer-To” header uses  
the transferred target’s Contact header information.  
DTMF Payload Type  
DTMF in Audio  
This parameter sets the payload type for DTMF using RFC2833  
Send DTMF as inband (in-audio).  
DTMF Via RFC2833  
DTMF Via SIP INFO  
Send Flash Event  
Enable Call Features  
Send DTMF via RTP (According to RFC 2833)  
Send DTMF via SIP INFO message.  
Default is No. If set to yes, flash will be sent as DTMF event.  
Default is Yes. Toggles support for advanced call features and star code functions.  
Offhook  
Auto-Dial  
This parameter allows users to configure a User ID or extension number to be  
automatically dialed upon offhook. Please note that only the user part of a SIP address  
needs to be entered here. The HT503 will automatically append the “@” and the host  
portion of the corresponding SIP address.  
Note: Please write down the IP address of the ATA if you use this feature as it  
will prevent access to the IVR and the only way to access the device configuration will  
be via the web configuration page.  
Proxy-Require  
Use NAT IP  
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.  
NAT IP address used in SIP/SDP message. Default is blank  
Distinctive Ring Tone  
Customizes Ring Tones 1 to 3 with an associated Caller ID. When selected, the device  
will ONLY use this ring tone when the incoming call is set up for Caller ID. The System  
Ring Tone is used for all other calls. When selected with no Caller ID configured, the  
selected ring tone will be used for all incoming calls.  
Disable Call Waiting  
Default is No.  
Disable Call Waiting  
Tone  
Default is No. This is to disable the stutter Call Waiting Tone during a CWC. The  
CWCID will still be displayed.  
Ring Timeout  
Sets the time in which an incoming call will stop ringing when not picked up.  
Default is 4 seconds.  
No Key Entry Timeout  
Early Dial  
Default is No. Use only if proxy supports 484 response. This parameter controls  
whether the phone will send an early INVITE each time a key is pressed when a user  
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dials a number. If set to “Yes”, an INVITE is sent using the dial-number collected thus  
far. Otherwise, no INVITE is sent until the “(Re-)Dial” button is pressed or after about 5  
seconds have elapsed. The “Yes” option should be used ONLY if there is a SIP proxy  
configured and the proxy server supports 484 Incomplete Address response.  
Otherwise, the call will likely be rejected by the proxy (with a 404 Not Found error).  
Note: This feature is NOT designed to work with and should NOT be enabled for  
direct IP-to-IP calling.  
Dial Plan Prefix  
Sets the prefix added to each dialed number.  
Use # as Dial key  
This allows users to configure the # key as the “Send” (or “Dial”) key. If set to “Yes”, “#”  
will send the number. In this case, this key is essentially equivalent to the “Dial” key. If  
set to “No”, the “#” key can be included as part of a number.  
Dial Plan  
Dial Plan Rules:  
1. Accept Digits: 1,2,3,4,5,6,7,8,9,0  
2. Grammar: x - any digit from 0-9;  
a. xx+ - at least 2 digit number;  
b. ^ - exclude;  
c. [3-5] - any digit of 3, 4, or 5;  
d. [147] - any digit 1, 4, or 7;  
e. <2=011> - replace digit 2 with 011 when dialing  
Example 1: {[369]11 | 1617xxxxxxx} –  
Allow 311, 611, 911, and any 10 digit numbers of leading digits 1617  
Example 2: {^1900x+ | <=1617>xxxxxxx} –  
Block any number of leading digits 1900 and add prefix 1617 for any dialed 7 digit  
numbers  
Example 3: {1xxx[2-9]xxxxxx | <2=011>x+} –  
Allow any length of number with leading digit 2 and 10 digit-numbers of leading  
digit 1 and leading exchange number between 2 and 9; If leading digit is 2,  
replace leading digit 2 with 011 before dialing  
3. Default: Outgoing - {x+}  
Subscribe for MWI  
Send Anonymous  
Default is “No.” When set to “Yes” a SUBSCRIBE for Message Waiting Indication will  
be sent periodically.  
When set to “Yes”, the “From” header along with Privacy and P_Asserted_Identity  
headers in outgoing INVITE messages will be set to anonymous, blocking Caller ID.  
Anonymous Call  
Rejection  
Default is “No.” If set to “Yes”, incoming calls with anonymous Caller ID will be rejected  
with a 486 busy message.  
Special Features  
Default is “Standard.” Choose the selection to meet some special requirements from  
Softswitch vendors.  
Preferred Vocoder  
The HT503 supports 5 different Vocoder types including  
1. G.711 A/µ law, (Displayed as PCMA/PCMU)  
2. G.723.1,  
3. G.726 (Supports bit rates 16, 24, 32, and 40)  
4. G.729A/B/E,  
5. iLBC  
Users can configure Vocoders in a preference list that will be included with the same  
preference order in SDP message.  
G723 Rate:  
This defines the encoding rate for G723 vocoder. Default setting is 6.3kbps.  
This sets the iLBC size in 20ms or 30ms  
iLBC Frame Size:  
iLBC Payload Type:  
This defines payload type for iLBC. Default value is 97. The valid range is between 96  
and 127.  
G726-16 Payload Type  
G726-24 Payload Type  
G726-40 Payload Type  
G729E Payload Type  
VAD  
Defines payload type for G726-16. Default value is 98. Range is from 96 to 127.  
Defines payload type for G726-24. Default value is 99. Range is from 96 to 127.  
Defines payload type for G726-40. Default value is 103. Range is from 96 to 127.  
Defines payload type for G729E. Default value is 102. Range is from 96 to 127  
Default is “No.” VAD allows detecting the absence of audio and conserves bandwidth  
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by preventing the transmission of “silent packets” over the network.  
Symmetric RTP  
Default is “No.” When set to “Yes” the device will change the destination to send RTP  
packets to the source IP address and port of the inbound RTP packet last received by  
the device.  
Fax Mode  
T.38 (Auto Detect) FoIP by default, or fax Pass-Through (must use PCMU/PCMA)  
Fax Detection Mode  
Default is Callee. This decides whether Caller or Callee sends out the re-invite for T.38  
or Fax Pass-Through.  
Jitter Buffer Type  
Jitter Buffer Length  
SRTP Mode  
Select either Fixed or Adaptive based on network conditions.  
Select Low, Medium, or High based on network conditions.  
Secure RTP protocol used for media transmission over VoIP. Disabled by default.  
Other modes are: enabled but not forced & enabled and forced.  
SLIC Setting  
Dependent on standard phone type (and location).  
Called ID Scheme  
Caller ID TX Level (dB)  
Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan  
A value for Caller ID information sent by a phone connected to the FXS port.  
(-96 – 0dB. Default -14dB)  
Polarity Reversal  
If set to “Yes”, polarity will be reversed upon call establishment and termination.  
Default is No.  
Loop Current Disconnect Set it to “Yes” of the traditional PBX you are using with HT503 uses this method fir  
signaling call termination. Default is No.  
Loop Current Disconnect A configurable period of time in which the FXS port will drop off voltage on the line to  
Duration  
indicate to the local party that the call is disconnected from the remote side.  
(100-10000 ms. Default 200 ms)  
Hook Flash Timing  
The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust  
this time value to prevent unwanted activation of the Flash/Hold and automatic phone  
ring-back.  
Gain  
Handset volume adjustment.  
RX is for receiving volume,  
TX is for transmission volume.  
Default values are 0dB for both parameters. Loudest volume: +6dB Lowest volume: -  
6dB.  
Call Progress/ Ring  
Tones  
This function lets you configure ring or tone frequencies according to preference. By  
default tones are set to North American frequencies. Frequencies should be  
configured with known values to avoid high pitch sounds.  
TABLE 11: HT503 FXO PORT SETTINGS PAGES DEFINITIONS  
Account Active  
SIP Server  
When set to “Yes” the FXO port is activated.  
SIP Server’s IP address or Domain name provided by VoIP Service Provider.  
Outbound Proxy  
IP address or Domain name of Outbound Proxy, or Media Gateway, or Session Border  
Controller. Used by HT503 for firewall or NAT penetration in different network  
environments. If symmetric NAT is detected, STUN will not work and ONLY way to  
correct the problem is to use the outbound proxy.  
SIP Transport  
User can select UDP, TCP or TLS  
NAT Traversal (STUN)  
This parameter defines whether or not the HT503 NAT traversal mechanism is  
activated. If set to “Yes” with a STUN server also specified, the HT503 will perform  
according to the STUN client specification. Using this mode, the embedded STUN  
client will detect if and what type of firewall/NAT is being used. If the detected NAT is a  
Full Cone, Restricted Cone, or a Port-Restricted Cone, the HT503 will use its mapped  
public IP address and port in all of its SIP and SDP messages. If the NAT Traversal  
field is set to “Yes” with no specified STUN server, the HT503 will periodically (every 20  
seconds or so) send a blank UDP packet (with no payload data) to the SIP server to  
keep the “hole” on the NAT open.  
SIP User ID  
User account information, provided by VoIP service provider (ITSP). Usually in the form  
of digit similar to phone number or actually a phone number.  
Authenticate ID  
The SIP service subscriber’s ID used for authentication. Can be identical to or different  
from SIP User ID.  
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Authenticate Password  
Name  
SIP service subscriber’s account password.  
SIP service subscriber’s name for Caller ID display.  
Use DNS SRV  
Default is “No.” If set to “Yes” the client will use DNS SRV to look up the server.  
User ID is Phone Number  
If the HT503 has an assigned PSTN telephone number, this field should be set to  
“Yes”. Otherwise, set it to “No”.  
If “Yes” is set, a “user=phone” parameter will be attached to the “From” header in SIP  
request.  
SIP Registration  
Controls whether the HT503 needs to send REGISTER messages to the proxy server.  
The default setting is “Yes.”  
Unregister on Reboot  
Default is No. If set to Yes, the SIP user’s registration information will be cleared on  
reboot.  
Outgoing Call Without  
Registration  
Default is No. If set to “Yes,” user can place outgoing calls even when not registered (if  
allowed by ITSP) but is unable to receive incoming calls.  
Register Expiration  
This parameter allows the user to specify the time frequency (in minutes) the HT503  
refreshes its registration with the specified registrar. The default interval is 60 minutes  
(or 1 hour). The maximum interval is 65535 minutes (about 45 days).  
Local SIP Port  
Local RTP Port  
Defines the local SIP port the HT503 will listen and transmit. The default value for FXS  
port is 5062.  
Defines the local RTP-RTCP port pair the HT503 will listen and transmit. It is the base  
RTP port for channel 0. When configured,  
channel 0 uses this port _value for RTP and the port_value+1 for its RTCP; channel 1  
uses port_value+2 for RTP and port_value+3 for its RTCP.  
The default value for FXS port 1 is 5012.  
Use Random Port  
This parameter forces the random generation of both the local SIP and RTP ports when  
set to Yes. This is usually necessary when multiple HT503 units are behind the same  
NAT.  
Refer to Use Target  
Contact  
Default is NO. If set to YES, then for Attended Transfer, the “Refer-To” header uses the  
transferred target’s contact header information.  
DTMF Payload Type  
DTMF in Audio  
Sends DTMF using RFC2833  
Sends DTMF as inband (in-audio).  
DTMF via RFC2833  
DTMF via SIP INFO  
Send Flash Event  
Enable Call Features  
Proxy Require  
Sends DTMF via RTP (according the RFC2833).  
Send DTMF as a SIP INFO message.  
Default is No. If set to “Yes”, flash will be sent as DTMF event  
Default is Yes. Toggles support for advanced call features and star code functions.  
SIP Extension to notify SIP server that the unit is behind a NAT/Firewall.  
NAT IP address used in SIP/SDP message. Default is blank.  
Use NAT IP  
Distinctive Ring Tone  
Customizes Ring Tones 1 to 3 with an associated Caller ID. When selected, the device  
will ONLY use this ring tone when the incoming call is set up for Caller ID. The System  
Ring Tone is used for all other calls. When selected with no Caller ID configured, the  
selected ring tone will be used for all incoming calls.  
Disable Call Waiting  
Turns off the Call Waiting feature. Default is No.  
Disable Call Waiting  
Tone  
Default is No. This is to disable the stutter Call Waiting Tone during a CWC. The  
CWCID will still be displayed.  
Ring Timeout  
Early Dial  
Sets the time in which an incoming call will stop ringing when not picked up.  
Default is No. Use only if proxy supports 484 response. This parameter controls  
whether the phone will send an early INVITE each time a key is pressed when a user  
dials a number. If set to “Yes”, an INVITE is sent using the dial-number collected thus  
far. Otherwise, no INVITE is sent until the “(Re-)Dial” button is pressed or after about 5  
seconds have elapsed. The “Yes” option should be used ONLY if there is a SIP proxy  
configured and the proxy server supports 484 Incomplete Address response.  
Otherwise, the call will likely be rejected by the proxy (with a 404 Not Found error).  
Note: This feature is NOT designed to work with and should NOT be enabled for  
direct IP-to-IP calling.  
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Dial Plan Prefix  
Sets the prefix added to each dialed number.  
Use # as Dial Key  
This allows users to configure the # key as the “Send” (or “Dial”) key. If set to “Yes”, “#”  
will send the number. In this case, this key is essentially equivalent to the “Dial” key. If  
set to “No”, the “#” key can be included as part of a number.  
Dian Plan  
Dial Plan Rules:  
1. Accept Digits: 1,2,3,4,5,6,7,8,9,0  
2. Grammar: x - any digit from 0-9;  
f. xx+ - at least 2 digit number;  
g. ^ - exclude;  
h. [3-5] - any digit of 3, 4, or 5;  
i.  
[147] - any digit 1, 4, or 7;  
j. <2=011> - replace digit 2 with 011 when dialing  
Example 1: {[369]11 | 1617xxxxxxx} –  
Allow 311, 611, 911, and any 10 digit numbers of leading digits 1617  
Example 2: {^1900x+ | <=1617>xxxxxxx} –  
Block any number of leading digits 1900 and add prefix 1617 for any dialed 7 digit  
numbers  
Example 3: {1xxx[2-9]xxxxxx | <2=011>x+} –  
Allow any length of number with leading digit 2 and 10 digit-numbers of leading  
digit 1 and leading exchange number between 2 and 9; If leading digit is 2,  
replace leading digit 2 with 011 before dialing  
3. Default: Outgoing - {x+}  
Subscribe for MWI  
Send Anonymous  
Default is “No.” When set to “Yes” a SUBSCRIBE for Message Waiting Indication will  
be sent periodically.  
When set to “Yes”, the “From” header along with Privacy and P_Asserted_Identity  
headers in outgoing INVITE messages will be set to anonymous, blocking Caller ID.  
Anonymous Call  
Rejection  
Default is “No.” If set to “Yes”, incoming calls with anonymous Caller ID will be rejected  
with a 486 busy message.  
Special Features  
Default is “Standard.” Choose the selection to meet some special requirements from  
Softswitch vendors.  
Preferred Vocoder  
The HT503 supports 5 different Vocoder types including  
1. G.711 A/µ law, (Displayed as PCMA/PCMU)  
2. G.723.1,  
3. G.726 (Supports bit rates 16, 24, 32, and 40)  
4. G.729A/B/E,  
5. iLBC  
Users can configure Vocoders in a preference list that will be included with the same  
preference order in SDP message.  
G723 Rate  
This defines the encoding rate for G723 vocoder. Default setting is 6.3kbps.  
This sets the iLBC size in 20ms or 30ms  
iLBC Frame Size  
iLBC Payload Type  
This defines the payload type for iLBC. Default value is 97. The valid range is between  
96 and 127.  
G726-16 Payload  
G726-24 Payload Type  
G726-40 Payload Type  
G729E Payload Type  
VAD  
Defines payload type for G726-16. Default value is 100. Range is from 96 to 127.  
Defines payload type for G726-24. Default value is 99. Range is from 96 to 127.  
Defines payload type for G726-40. Default value is 103. Range is from 96 to 127.  
Defines payload type for G729E. Default value is 102. Range is from 96 to 127  
Default is “No.” VAD allows detecting the absence of audio and conserves bandwidth  
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by preventing the transmission of “silent packets” over the network.  
Symmetric RTP  
Fax Mode  
Default is “No.” When set to “Yes” the device will change the destination to send RTP  
packets to the source IP address and port of the inbound RTP packet last received by  
the device.  
T.38 (Auto Detect) FoIP by default, or fax Pass-Through (must use PCMU/PCMA)  
Fax Tone Detection  
Mode  
Default is Callee. This decides whether Caller or Callee sends out the re-invite for T.38  
or Fax Pass-Through.  
Jitter Buffer Type  
Jitter Buffer Length  
SRTP Mode  
Select either Fixed or Adaptive based on network conditions.  
Select Low, Medium, or High based on network conditions.  
Secure RTP protocol used for media transmission over VoIP. Disabled by default.  
Other modes are: enabled but not forced & enabled and forced.  
Caller ID Scheme  
Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan  
Caller ID RX Level (dB)  
An adjustable value for the Caller ID signal to help our device to recognize Caller ID  
from different networks. (-96 -0dB. Default -15dB)  
Hook Flash Timing  
Gain  
The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust  
this time value to prevent unwanted activation of the Flash/Hold and automatic phone  
ring-back.  
Handset volume adjustment.  
RX is for receiving volume,  
TX is for transmission volume.  
Default = 0dB for both parameters. Loudest volume: +6dB Lowest volume: -6dB.  
Enable Current  
Disconnect  
The Default value is Yes. This value should be used in case the PSTN provider uses  
line power drop to indicate call completion to the end point. In this case the HT503 will  
search for a power drop for a preconfigured time frame to disconnect such calls from a  
VoIP extension.  
Current Disconnect  
Threshold (ms)  
This is a preconfigured value of duration for a line power drop used by specific service  
providers. For example, for a configured value of 500ms the device will ignore any  
random voltage drops on the line less than 500ms and the call will be considered as  
terminated. This is useful to prevent call drops in some low quality PSTN lines.  
Enable PSTN Disconnect If set to Yes, a Tone is used as the disconnect signal.  
Tone Detection  
PSTN Disconnect Tone  
In certain countries, the central office will send a special busy tone to indicate when a  
call is disconnected from the remote side. To make the HT503 recognizable, this  
parameter can pre-configure this tone. The user should know the frequency values  
and cadences of these tones.  
Here is an example for the syntax for a busy tone in the U.S.A:  
(Syntax: f1=freq@vol, f2=freq@vol, c=on1/off1-on2/off2-on3/off3; [...])  
(Note: freq: 0 - 4000Hz; vol: -30 - 0dBm)  
(Default: Busy Tone - f1=480@-24,f2=620@-24,c=500/500;)  
AC Termination  
Number of Rings  
AC Termination is a configurable value of impedance of the line provided by different  
service providers in different countries. 14 are selectable in this version of the F/W.  
Default is 4. This setting specifies number of phone rings (on the phone connected to  
the FXS port) before a PSTN incoming call is bridged to VoIP  
Note: The number of rings feature serves as a PSTN answer delay, and should be set  
to a larger value to allow enough time for the HT503 to decode the Caller ID signal set  
by the central office.  
PSTN Ring Thru FXS  
If Yes, the phone connected to the FXS port will ring a configured amount of times (see  
above). If not, the phone connected to the FXS port will not ring.  
PSTN Ring Thru Delay  
(sec)  
If the PSTN Ring Thru Delay is set to Yes, all incoming PSTN calls through FXO will  
ring the phone connected to the FXS port, after this delay or after caller id is detected  
(whichever comes first).  
DTMF Digit Length (ms)  
Digit length and Dial Pause are port digit dialing configurations; FXO needs to dial out  
digits for VOIP to PSTN 1 stage calls, and unconditional call forward to PSTN, and  
route to PSTN. Digit Length is the play time for each digit.  
Note: In order to receive the caller ID information, the delay should be set to a value  
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larger than the delay required to complete the PSTN caller ID delivery.  
DTMF Dial Pause (ms)  
First Digit Timeout (sec)  
Dial pause is the time between 2 digits for the same scenario as explained above.  
Used for PSTN to VoIP calls. PSTN users need to enter the FIRST digit within the first  
digit timeout period. Otherwise the call will be dropped.  
Inter Digit Timeout  
Wait for Dial Tone  
When dialing from the PSTN to VoIP, subsequent digits have to be input within the  
period of inter-digit timeout. Otherwise the dial plan thinks it is the end of the digit input.  
Wait for Dial tone is used for one stage VoIP to PSTN calls. If set to Yes, the device  
will first obtain a PSTN line and a dial tone from a central office. After obtaining the dial  
tone, the digits dialed will be sent to the central office.  
Stage Method (1/2)  
This configuration is applicable for VoIP to PSTN calls and indicates one or two stage  
dialing methods.  
Note: General settings have the same meaning as explained in the FXS page definitions. Here they are  
described only as parameters related to the FXO port.  
TABLE 12: HT503 CALL PROGRESS TONES SETTINGS PAGE DEFINITIONS  
Call Progress Tones  
Using these settings, user can configure tone frequencies according to their preference.  
By default they are set to North American frequencies.  
Frequencies should be configured with known values to avoid uncomfortable high pitch  
sounds. ON is the period of ringing (“On time” in ‘ms’) while OFF is the period of  
silence. In order to set a continuous tone, OFF should be zero. Otherwise it will ring ON  
ms and a pause of OFF ms and then repeat the pattern.  
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SAVING THE CONFIGURATION CHANGES  
Once a change is made, users should click on the “Update” button in the Configuration page. The HT503  
will display a confirmation screen to confirm that the changes have been saved. Click ‘Reboot’ to save  
all changes. Please reference the GUI pages using the following link:  
Remote Reboot of the HT503  
The administrator can remotely reboot the HT503 by clicking on the “Reboot” button at the bottom of the  
configuration page. Once done, the following screen will be displayed to indicate that rebooting is  
underway. You can login again after about 30 seconds.  
FIGURE 4: SCREENSHOT OF REBOOTING SCREEN  
Grandstream Device Configuration  
The device is rebooting now...  
You may relogin by clicking on the link below in 30 seconds.  
All Rights Reserved Grandstream Networks, Inc. 2004  
NOTE: Interrupting the ‘booting up’ process could permanently damage the device.  
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CONFIGURATION THROUGH A CENTRAL SERVER  
The Grandstream HT503 can be automatically configured from a central provisioning system.  
When the HT503 boots up, it will send TFTP or HTTP request to download configuration file,  
“cfg000b82xxxxxx”, where “000b82xxxxxx” is the LAN side MAC address of the HT503  
The configuration files can be downloaded via TFTP or HTTP from the central server. A service provider  
or an enterprise with large deployment of HT503 can easily manage the configuration and service  
provisioning of individual devices remotely from a central server.  
Grandstream provides a licensed provisioning system called GAPS that can be used to support  
automated configuration of HT503. GAPS (Grandstream Automated Provisioning System) uses enhanced  
(NAT friendly) TFTP or HTTP (thus no NAT issues) and other communication protocols to communicate  
with each individual HT503 for firmware upgrade, remote reboot, etc.  
Grandstream provide GAPS (Grandstream Automated Provisioning System) service to VoIP service  
providers. It could be either simple redirection or with certain special provisioning settings. Initially upon  
booting up, Grandstream devices by default point to Grandstream provisioning server GAPS, based on  
the unique MAC address of each device, GAPS provision the devices with redirection settings so that  
they will be redirected to customer’s TFTP or HTTP server for further provisioning. Grandstream also  
provide GAPSLITE software package which contains our NAT friendly TFTP server and a configuration  
tool to facilitate the task of generating device configuration files.  
The GAPSLITE configuration tool is now free to end users. The tool and configuration template are  
Grandstream Networks, Inc.  
HT503 User Manual  
Page 32 of 35  
Firmware 1.0.0.6  
Last Updated: 6/2007  
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SOFTWARE UPGRADE  
Software upgrade can be done via either TFTP or HTTP. The corresponding configuration settings are in  
the ADVANCED SETTINGS configuration page.  
FIRMWARE UPGRADE THROUGH TFTP/HTTP  
To upgrade via TFTP or HTTP, the “Firmware Upgrade and Provisioning upgrade via” field needs to be  
set to TFTP or HTTP, respectively. “Firmware Server Path” needs to be set to a valid URL of a TFTP or  
HTTP server, server name can be in either FQDN or IP address format. Here are examples of some valid  
URL.  
e.g. firmware.mycompany.com:6688/Grandstream/1.0.0.6  
e.g. 168.75.215.190  
NOTES:  
1. The TFTP server in IP address format can be configured via IVR. Please refer to the  
CONFIGURATION GUIDE section for instructions. If the TFTP server is in FQDN format, it must  
be set via the web configuration interface.  
2. End users recommended using our TFTP server. Its address can be found at  
http://www.grandstream.com/firmware.html. Currently, the TFTP server, your HT503 can be  
upgraded from has an IP address 168.75.215.189. For companies, we recommend to maintain  
their own TFTP/ HTTP server for upgrade and provisioning procedures.  
3. Once a “Firmware Server Path” is set, the user needs to update the settings and reboot the  
device. If the configured firmware server is found and a new code image is available, the HT503  
will attempt to retrieve the new image files by downloading them into the SRAM. During this  
stage, the HT503 LEDs will blink until the checking/downloading process is completed. Upon  
verification of checksum, the new code image will then be saved into the Flash. If TFTP/HTTP  
fails for any reason (e.g., TFTP/HTTP server is not responding, there are no code image files  
available for upgrade, or checksum test fails, etc), the HT503 will stop the TFTP/HTTP process  
and simply boot using the existing code image in the flash.  
4. Firmware upgrades usually take around 2 minutes when performed on a LAN. It is recommended  
to conduct firmware upgrade in a controlled LAN environment if possible. For users who do not  
have a local firmware upgrade server, Grandstream provides a NAT-friendly TFTP server on the  
public Internet for firmware upgrade. Please check the Services section of Grandstream’s Web  
site to obtain our public TFTP server’s IP address.  
5. Alternatively, user can download a free TFTP or HTTP server and conduct local firmware  
upgrade.  
A
free windows version TFTP server is available for download from  
http://support.solarwinds.net/updates/New-customerFree.cfm. Our latest official release can be  
Directions to download a free TFTP Server:  
1. Unzip the file and put all of them under the root directory of the TFTP server.  
2. Put the PC running the TFTP server and the GXW400X device in the same LAN segment.  
3. Please go to File -> Configure -> Security to change the TFTP server's default setting from  
"Receive Only" to "Transmit Only" for the firmware upgrade.  
4. Start the TFTP server, in the phone’s web configuration page  
5. Configure the Firmware Server Path with the IP address of the PC  
6. Update the change and reboot the unit  
The end-user can also choose to download the free HTTP server from http://httpd.apache.org/ or use  
Microsoft IIS web server.  
Grandstream Networks, Inc.  
HT503 User Manual  
Page 33 of 35  
Firmware 1.0.0.6  
Last Updated: 6/2007  
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CONFIGURATION FILE DOWNLOAD  
Grandstream SIP Device can be configured via Web Interface as well as via Configuration File through  
TFTP or HTTP. “Config Server Path” is the TFTP or HTTP server path for configuration file. It needs to be  
set to a valid URL, either in FQDN or IP address format. The “Config Server Path” can be same or  
different from the “Firmware Server Path”.  
A configuration parameter is associated with each particular field in the web configuration page.  
A
parameter consists of a Capital letter P and 2 to 3 (Could be extended to 4 in the future) digit numeric  
numbers. i.e., P2 is associated with “Admin Password” in the ADVANCED SETTINGS page. For a  
detailed parameter list, please refer to the corresponding firmware release configuration template.  
When Grandstream Device boots up or reboots, it will issue request for configuration file named  
“cfgxxxxxxxxxxxx”, where “xxxxxxxxxxxx” is the MAC address of the device, i.e., “cfg000b820102ab”. The  
configuration file name should be in lower cases.  
FIRMWARE AND CONFIGURATION FILE PREFIX AND POSTFIX  
Firmware Prefix and Postfix allows device to download the firmware name with the matching Prefix and  
Postfix. This makes it the possible to store ALL of the firmware with different version in one single  
directory. Similarly, Config File Prefix and Postfix allows device to download the configuration file with the  
matching Prefix and Postfix. Thus multiple configuration files for the same device can be stored in one  
directory.  
In addition, when the field “Check New Firmware only when F/W pre/suffix changes” is set to “Yes”, the  
device will only issue firmware upgrade request if there are changes in the firmware Prefix or Postfix.  
MANAGING FIRMWARE AND CONFIGURATION FILE DOWNLOAD  
When “Automatic Upgrade” is set to “Yes”, the Service Provider can use P193 (Auto Check Interval, in  
minutes, default and minimum is 60 minutes) to have the devices periodically check with either Firmware  
Server or Config Server, however they are defined. This allows the device to periodically check if there  
are any new changes need to be taken on a scheduled time. By defining different intervals in P193 for  
different devices, the Server Provider can spread the Firmware or Configuration File download in minutes  
to reduce the Firmware or Provisioning Server load at any given time.  
Grandstream Networks, Inc.  
HT503 User Manual  
Page 34 of 35  
Firmware 1.0.0.6  
Last Updated: 6/2007  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
RESTORE FACTORY DEFAULT SETTING  
WARNING!  
Restoring the Factory Default Setting will DELETE all configuration information of the  
phone. Please BACKUP or PRINT out all the settings before you approach to following steps.  
Grandstream will not take any responsibility if you lose all the parameters of setting and cannot connect  
to your VoIP service provider.  
FACTORY RESET  
IVR Command  
Reset default factory settings using the IVR Prompt (Table 5):  
1. Dial “***” for voice prompt.  
2. Enter “99” and wait for “reset” voice prompt.  
3. Enter the encoded MAC address (Look below on how to encode MAC address).  
4. Wait 15 seconds and device will automatically reboot and restore factory settings.  
Encoding the MAC Address  
1. Locate the MAC address of the device. It is the 12 digit HEX number on the bottom of the  
unit.  
2. Key in the MAC address. Use the following mapping:  
0-9: 0-9  
a. A: 22 (press the “2” key twice, “A” will show on the LCD)  
b. B: 222  
c. C: 2222  
d. D: 33 (press the “3” key twice, “D” will show on the LCD)  
e. E: 333  
f. F: 3333  
For example: if the MAC address is 000b8200e395, it should be keyed in as “0002228200333395”.  
RESET Button  
Initiate the Factory Reset procedure by pressing the RESET button located in back panel of the device for  
approximately 8 seconds. All port LEDs will turn on and device will restart itself.  
NOTE:  
1. Factory Reset will be disabled if the “Lock keypad update” is set to “Yes”.  
2. Please be aware by default the HT503 WAN side HTTP access is disabled. After a factory reset, the  
device’s web configuration page can be accessed only from its LAN port.  
3. If the HT503 was previously locked by your local service provider, pressing the RESET button will  
only restart the unit. The device will not return to factory default settings.  
Grandstream Networks, Inc.  
HT503 User Manual  
Page 35 of 35  
Firmware 1.0.0.6  
Last Updated: 6/2007  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 

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