C H A P T E R 2
Preparing to Install the Cisco
Unified IP Phone on Your Network
Cisco Unified IP Phones enable you to communicate using voice over a data
network. To provide this capability, the phones depend upon and interact with
several other key Cisco IP Telephony and network components, including
Cisco Unified Communications Manager, DNS and DHCP servers, TFTP servers,
media resources, Cisco prestandard PoE, and so on.
This chapter focuses on the interactions between the Cisco Unified IP Phone
7931G and Cisco Unified Communications Manager, DNS and DHCP servers,
TFTP servers, and switches. It also describes options for powering phones.
For related information about voice and IP communications, refer to this URL
(you must be a registered Cisco.com user):
This chapter includes these topics:
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Understanding Interactions with Other Cisco Unified IP Communications Products
For information about configuring Cisco Unified Communications Manager to
work with the IP devices that described in this chapter, refer to Cisco
Unified Communications Manager Administration Guide, Cisco Unified
Communications Manager System Guide, and to Cisco Unified Communications
Manager Security Guide.
For an overview of security functionality for the Cisco Unified IP Phone, see the
“Understanding Security Features for Cisco Unified IP Phones” section on
page 1-14.
Note
If the Cisco Unified IP Phone model that you want to configure does not appear
in the Phone Type drop-down list in Cisco Unified Communications Manager
Administration, go to the following URL and install the latest support patch for
your version of Cisco Unified Communications Manager:
Related Topic
•
Telephony Features Available for the Phone, page 5-2
Understanding How the Cisco Unified IP Phone Interacts with the
VLAN
The Cisco Unified IP Phone 7931G has an internal Ethernet switch, enabling
forwarding of packets to the phone, and to the access port and the network port on
the back of the phone.
If a computer is connected to the access port, the computer and the phone share
the same physical link to the switch and share the same port on the switch. This
shared physical link has the following implications for the VLAN configuration
on the network:
•
The current VLANs might be configured on an IP subnet basis. However,
additional IP address might not be available to assign the phone to the same
subnet as other devices connect to the same port.
•
•
Data traffic present on the data/native VLAN may reduce the quality of
Voice-over-IP traffic.
Network security may indicate a need to isolate the VLAN voice traffic from
the VLAN data traffic.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
You can resolve these issues by isolating the voice traffic onto a separate VLAN.
The switch port that the phone is connected to would be configured to have
separate VLANs for carrying:
•
Voice traffic to and from the IP phone (auxiliary VLAN, on the Cisco Catalyst
6000 series, for example)
•
Data traffic to and from the PC connected to the switch through the access
port of the IP phone (native VLAN)
Isolating the phones on a separate, auxiliary VLAN improves the quality of the
voice traffic and allows a large number of phones to be added to an existing
network where there are not enough IP addresses for each phone.
For more information, refer to the documentation included with a Cisco switch.
You can also access related documentation at this URL:
Related Topics
•
•
Network Configuration Menu, page 4-7
Providing Power to the Phone
The Cisco Unified IP Phones 7931G can be powered with external power or with
Power over Ethernet (PoE). External power is provided through a separate power
supply. PoE is provided by a switch through the Ethernet cable attached to a
phone.
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•
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Providing Power to the Phone
Power Outage
Your accessibility to emergency service through the phone is dependent on the
phone being powered. If there is an interruption in the power supply, Service and
Emergency Calling Service dialing will not function until power is restored. In the
case of a power failure or disruption, you may need to reset or reconfigure
equipment before using the Service or Emergency Calling Service dialing.
Power Guidelines
Table 2-1 provides guidelines that apply to external power and to PoE power for
the Cisco Unified IP Phones 7931G.
Table 2-1
Guidelines for Powering the Cisco Unified IP Phones 7931G
Power Type
Guidelines
External power—
The CP-PWR-CUBE-3 external power supply may be used with the
Provided through a Cisco Cisco Unified IP Phones 7931G.
external power supply.
External power—
Provided through the
Cisco Unified IP Phone
Power Injector.
The Cisco Unified IP Phone Power Injector may be used with any
Cisco Unified IP Phone. Functioning as a midspan device, the injector
delivers inline power to the attached phone. The Cisco Unified IP Phone
Power Injector is connected between a switch port and the IP Phone, and
supports a maximum cable length of 100m between the unpowered switch
and the phone.
PoE power—Provided by
a switch through the
Ethernet cable attached to
the phone.
•
•
•
The Cisco Unified IP Phones 7931G supports IEEE 802.3af Power
over Ethernet.
To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply.
Make sure that the CatOS or IOS version running on your switch
supports your intended phone deployment. Refer to the documentation
for your switch for operating system version information.
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Understanding Phone Configuration Files
Obtaining Additional Information about Power
These documents provide information about these topics:
•
•
•
Cisco switches that work with the Cisco Unified IP Phones
The Cisco IOS releases that support bidirectional power negotiation
Other requirements and restrictions regarding power
Table 2-2
Related Documentation for Power
Document Topics
URL
PoE Solutions
Cisco Catalyst Switches
Integrated Service Routers
Cisco IOS Software
Understanding Phone Configuration Files
Configuration files for a phone are stored on the TFTP server and define
parameters for connecting to Cisco Unified Communications Manager. In
general, any time you make a change in Cisco Unified Communications Manager
that requires the phone to be reset, a change is made automatically to the phone
configuration file.
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Understanding Phone Configuration Files
Configuration files also contain information about which image load the phone
should be running. If this image load differs from the one currently that is loaded
on a phone currently, the phone contacts the TFTP server to request the required
load files. (These files are digitally signed to ensure the authenticity of the file
source.)
In addition, if the device security mode in the configuration file is set to
Authenticated and the CTL file on the phone has a valid certificate for Cisco
Unified Communications Manager, the phone establishes a TLS connection to
Cisco Unified Communications Manager. Otherwise, the phone establishes a TCP
connection.
Note
If the device security mode in the configuration file is set to Authenticated or
Encrypted, but the phone has not received a CTL file, the phone will continuously
try to obtain a CTL file so that it can register securely.
If you configure security-related settings in Cisco Unified Communications
Manager Administration, the phone configuration file will contain sensitive
information. To ensure the privacy of a configuration file, you must configure it
for encryption. For detailed information, refer to the “Configuring Encrypted
Phone Configuration Files” chapter in Cisco Unified Communications Manager
Security Guide.
A phone accesses a default configuration file named XmlDefault.cnf.xml from the
TFTP server when these conditions exist:
•
•
•
You have enabled auto-registration in Cisco Unified Communications
Manager
The phone has not been added to the Cisco Unified Communications Manager
database
The phone is registering for the first time
If auto registration is not enabled and the phone has not been added to the Cisco
Unified Communications Manager Database, the phone registration request will
be rejected. In this case, the phone resets and attempts to register repeatedly.
If the phone has registered before, the phone accesses the configuration file
named SEPmac_address.cnf.xml, where mac_address is the MAC address of the
phone.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
For more information about how the phone interacts with the TFTP server, refer
to the Cisco Unified Communications Manager System Guide, “Cisco TFTP”
chapter.
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone goes through
configuration, not all of these process steps may occur on your Cisco
Unified IP Phone.
Table 2-3
Cisco Unified IP Phone Startup Process
Process Step and Purpose
Related Topics
Step 1
Step 2
Obtaining Power from the Switch
See the “Providing Power to the Phone”
If a phone is not using external power, the switch
provides in-line power through the Ethernet cable See the “Resolving Startup Problems”
attached to the phone.
section on page 9-2.
Loading the Stored Phone Image
See the “Resolving Startup Problems”
section on page 9-2.
The Cisco Unified IP Phone has non-volatile Flash
memory in which it stores firmware images and
user-defined preferences. At startup, the phone
runs a bootstrap loader that loads a phone image
stored in Flash memory. Using this image, the
phone initializes its software and hardware.
Step 3
Configuring VLAN
See the “Network Configuration Menu”
section on page 4-7.
If the Cisco Unified IP Phone is connected to a
Cisco switch, the switch next informs the phone of See the “Resolving Startup Problems”
the voice VLAN defined on the switch port. The
phone needs to know its VLAN membership before
it can proceed with the Dynamic Host
Configuration Protocol (DHCP) request for an IP
address.
section on page 9-2.
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Understanding the Phone Startup Process
Table 2-3
Cisco Unified IP Phone Startup Process (continued)
Related Topics
Process Step and Purpose
Step 4
Step 5
Obtaining an IP Address
See the “Network Configuration Menu”
section on page 4-7.
If the Cisco Unified IP Phone is using DHCP to
obtain an IP address, the phone queries the DHCP See the “Resolving Startup Problems”
server to obtain one. If you are not using DHCP in section on page 9-2.
your network, you must assign static IP addresses
to each phone locally.
Accessing a TFTP Server
See the “Network Configuration Menu”
section on page 4-7.
In addition to assigning an IP address, the DHCP
server directs the Cisco Unified IP Phone to a
See the “Resolving Startup Problems”
TFTP Server. If the phone has a statically defined section on page 9-2.
IP address, you must configure the TFTP server
locally on the phone; the phone then contacts the
TFTP server directly.
Note
You can also assign an alternative TFTP
server to use instead of the one assigned by
DHCP.
Step 6
Requesting the CTL file
Refer to the Cisco Unified Communications
Manager Security Guide, “Configuring the
Cisco CTL Client” chapter.
The TFTP server stores the certificate trust list
(CTL) file. This file contains a list of Cisco
Unified Communications Managers and TFTP
servers that the phone is authorized to connect to.
It also contains the certificates necessary for
establishing a secure connection between the
phone and Cisco Unified Communications
Manager.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
Table 2-3
Cisco Unified IP Phone Startup Process (continued)
Process Step and Purpose
Related Topics
Step 7
Step 8
Requesting the Configuration File
See the “Understanding Phone
The TFTP server has configuration files, which
define parameters for connecting to Cisco
Unified Communications Manager and other
information for the phone.
See the “Resolving Startup Problems”
section on page 9-2.
The configuration file defines how the Cisco
Unified IP Phone communicates with Cisco
Unified Communications Manager and provides a
phone with its load ID. After obtaining the file
from the TFTP server, the phone attempts to make
a connection to the highest priority Cisco
Unified Communications Manager on the list. If
security is implemented, the phone makes a TLS
connection. Otherwise, it makes a non-secure TCP
connection.
See the “Resolving Startup Problems”
section on page 9-2.
If the phone was manually added to the database,
Cisco Unified Communications Manager identifies
the phone. If the phone was not manually added to
the database and auto-registration is enabled in
Cisco Unified Communications Manager, the
phone attempts to auto-register itself in the Cisco
Unified Communications Manager database.
Note
Auto-registration is disabled when security
is enabled on Cisco
Unified Communications Manager. In this
case, the phone must be manually added to
the Cisco Unified Communications
Manager database.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Adding Phones to the Cisco Unified Communications Manager Database
Adding Phones to the Cisco Unified Communications
Manager Database
Before installing the Cisco Unified IP Phone, you must choose a method for
adding phones to the Cisco Unified Communications Manager database. These
sections describe the methods:
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•
•
•
Table 2-4 provides an overview of these methods for adding phones to the Cisco
Unified Communications Manager database.
Table 2-4
Methods for Adding Phones to the Cisco Unified Communications Manager
Database
Requires MAC
Address?
Method
Notes
Auto-registration
No
Results in automatic assignment of directory
numbers.
Not available when security or encryption is
enabled.
Auto-registration with TAPS
No
Requires auto-registration and the Bulk
Administration Tool (BAT); updates the Cisco
Unified Communications Manager database with
the MAC address and DNs for the device when user
calls TAPS from the phone.
Using Cisco Unified
Communications Manager
Administration
Yes
Yes
Requires phones to be added individually.
Using BAT
Can add groups of same model of phone.
Can schedule when phones are added to the Cisco
Unified Communications Manager database.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Adding Phones to the Cisco Unified Communications Manager Database
Adding Phones with Auto-Registration
By enabling auto-registration before you begin installing phones, you can:
•
•
Add phones without first gathering MAC addresses from the phones.
Automatically add a Cisco Unified IP Phone to the Cisco Unified
Communications Manager database when you physically connect the phone
to your IP telephony network. During auto-registration, Cisco Unified
Communications Manager assigns the next available sequential directory
number to the phone.
•
•
Quickly enter phones into the Cisco Unified Communications Manager
database and modify any settings, such as the directory numbers, from
Cisco Unified Communications Manager.
Move auto-registered phones to new locations and assign them to different
device pools without affecting their directory numbers.
Note
Cisco recommends that you use auto-registration to add fewer than 100 phones to
your network. To add more than 100 phones to your network, use the Bulk
Auto-registration is disabled by default. In some cases, you might not want to use
auto-registration: for example, if you want to assign a specific directory number
to the phone, or if you plan to implement authentication or encryption, as
described in Cisco Unified Communications Manager Security Guide. For
information about enabling auto-registration, refer to “Enabling
Auto-Registration” in Cisco Unified Communications Manager Administration
Guide.
Note
When you configure the cluster for mixed mode through the Cisco CTL client,
auto-registration is automatically disabled. When you configure the cluster for
non-secure mode through the Cisco CTL client, auto-registration is automatically
enabled.
Related Topics
•
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Adding Phones to the Cisco Unified Communications Manager Database
•
•
Adding Phones with Auto-Registration and TAPS
You can add phones with auto-registration and TAPS, the Tool for
Auto-Registered Phones Support, without first gathering MAC addresses from
phones.
TAPS works with the Bulk Administration Tool (BAT) to update a batch of phones
that were already added to the Cisco Unified Communications Manager database
with dummy MAC addresses. Use TAPS to update MAC addresses and download
pre-defined configurations for phones.
Note
Cisco recommends that you use auto-registration and TAPS to add fewer than 100
phones to your network. To add more than 100 phones to your network, use the
To implement TAPS, you or the end-user dial a TAPS directory number and follow
voice prompts. When the process is complete, the phone will have downloaded its
directory number and other settings, and the phone will be updated in
Cisco Unified Communications Manager Administration with the correct MAC
address.
Auto-registration must be enabled in Cisco Unified Communications Manager
Administration (System > Cisco Communications Manager) for TAPS to
function.
Note
When you configure the cluster for mixed mode through the Cisco CTL client,
auto-registration is automatically disabled. When you configure the cluster for
non-secure mode through the Cisco CTL client, auto-registration is automatically
enabled.
Refer to Cisco Unified Communications Manager Bulk Administration Guide for
detailed instructions about BAT and about TAPS.
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Adding Phones to the Cisco Unified Communications Manager Database
Related Topics
•
•
•
Adding Phones with Cisco Unified Communications Manager
Administration
You can add phones individually to the Cisco Unified Communications Manager
database using Cisco Unified Communications Manager Administration. To do
so, you first need to obtain the MAC address for each phone.
For information about determining a MAC address, see the “Determining the
After you have collected MAC addresses, in Cisco Unified Communications
Manager Administration, choose Device > Phone and click Add New to begin.
For complete instructions and conceptual information about Cisco Unified
Communications Manager, refer to Cisco Unified Communications Manager
Administration Guide and Cisco Unified Communications Manager System
Guide.
Related Topics
•
•
•
Adding Phones with BAT
Cisco Unified Communications Manager Bulk Administration Tool (BAT), a
standard Cisco Unified Communications Manager application, enables you to
perform batch operations, which includes registration, on multiple phones.
Before you can add phones using BAT only (not in conjunction with TAPS), you
must obtain the MAC address for each phone.
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Determining the MAC Address of a Cisco Unified IP Phone
For information about determining a MAC address, see the “Determining the
For detailed instructions about using BAT, refer to Cisco Unified Communications
Manager Bulk Administration Guide.
Related Topics
•
•
•
Determining the MAC Address of a Cisco
Unified IP Phone
Several of the procedures that are described in this manual require you to
determine the MAC address of a Cisco Unified IP Phone. You can determine the
MAC address for a phone in any of these ways:
•
If the phone is registered with Cisco Unified Communications Manager, press
the Application Menu button, then choose Settings > Model Information
and look at the MAC Address field.
By default, the Application Menu button is line button 24 (the top left line
button).
•
If the phone is not registered with Cisco Unified Communications Manager,
press the Settings softkey, the choose Model Information and look at the
MAC Address field.
This softkey appears only when the phone is not registered.
Look at the MAC label on the back of the phone.
•
•
Display the web page for the phone and click the Device Information
hyperlink.
For information about accessing the web page, see the “Accessing the Web
Page for a Phone” section on page 8-2.
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Determining the MAC Address of a Cisco Unified IP Phone
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