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MCP RTP Media Portal
Basics
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3
Overview
How this chapter is organized
This chapter is organized as follows:
Functional description
The Real-time Transport Protocol (RTP) Media Portal is an optional
component of the network that performs many media-layer functions.
The RTP Media Portal addresses media specific issues with advanced
service delivery, Internet addressing efficiencies, and system security.
It functions as a media Network Address and Port Translation (NAPT)
point that shields private network components from external exposure
through leaks in the media streams. The RTP Media Portal also
enables elements in the private network to safely communicate with
elements in the public network. The RTP Media Portal provides IP
address/port pair mapping between internal and external network
components, as well as media anchoring and media pivot abilities for
terminals.
graphical representation of the RTP Media Portal interworking among
other components in the Multimedia Communications Portfolio.
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Figure 1 Network Component Interoperability
The clouds in the diagram represent two distinct networks. The Private
Network cloud interacts with the Public Network cloud through the
different edge components. The RTP Media Portal provides
media-layer functionality for Real-time Transport Protocol (RTP),
Real-time Transport Control Protocol (RTCP), and User Datagram
Protocol (UDP) transmissions.
Hardware
Description
The RTP Media Portal resides on a Motorola CPX8216T platform which
is a CompactPCI (cPCI) chassis design.
The chassis provides the basic operating environment (such as power,
backplane, cooling, and mounting slots) required to house cPCI-based
single-board computers. The CPX8216T partitions the chassis into two
separate logical operational domains (dividing the chassis shelf into
two half-shelves consisting of 8-slots each).
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Overview 5
An RTP Media Portal occupies a single chassis domain (side) on a
CPX8216T. Therefore, a single CPX8216T can host two RTP Media
Portal components (one in chassis Domain A, the other in chassis
Domain B).
Note: Chassis domains are not internet domains. This is just
another terminology intended to identify Side A and Side B of the
chassis. Other terms often used interchangeably are: Domain A and
Domain B, as well as Left Domain and Right Domain.
Figure 2 Card slots for the two different domains
Note 1: The Hot Swap Controller in the Left Domain (Domain A)
controls the Right Domain (Domain B). The Hot Swap Controller in
the Right Domain (Domain B) controls the Left Domain (Domain A).
Note 2: If the chassis is viewed from the front, the slots are
numbered from left to right (1-16), and if viewed from the rear, the
slots are numbered from right to left (1-16).
The CPX8216T dual 8-slot architecture further refines the domain
definition so that each chassis domain is dedicated to a Host CPU
board (with an associated transition module in the rear), another slot is
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dedicated to the Motorola Hot Swap Controller (HSC), and the
remaining six slots can be populated with peripheral resource cards
(Input/Output cards with an associated transition module in the rear)).
Each chassis half shelf consists of the following hardware components:
• Intel processor board with 1 GB memory and a SCSI Input/Output
(I/O) daughter board (CPV5370 host card)
• Hot Swap Controller and Bridge (HSC) module
• SCSI CD-ROM drive
• SCSI hard drive
• Floppy drive
• Motorola MCPN765 card(s) with 64 MB RAM
• Available ac or dc power options
Additional hardware (non-Motorola):
• Mouse, keyboard, monitor
Figure 3 Motorola chassis CPX8216T
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Overview 7
Software update maintenance loads
Information on updating software loads for the RTP Media Portal are
OAM&P strategy
The OAM&P strategy for the system is to manage operations from a
central location. The central location for OAM&P management is in the
System Management Console. From the System Management
Console, you can view and perform operations on the various
components in the system.
Interfaces
Protocols
While in service, the RTP Media Portal interfaces with the network
through the following protocols:
• MGCP+ is the Enhanced Media Gateway Control Protocol that is
used for messaging between the RTP Media Portal and the SIP
Application Module, and controls the making, modification and
breaking of media session connections.
• RTP is the Real-time Transport Protocol for transport of real-time
media streams (for example, audio and video) across a packet
network.
• RTCP is the Real-time Transport Control Protocol that provides a
means of sharing session data (for example, performance data)
between endpoints.
• UDP is the User Datagram Protocol that provides data-based media
streams (for example, file transfer).
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Figure 4 RTP Media Portal interfaces
Network Interfaces
The Host CPU card provides the signaling and OAM data interface
to/from the Private Network. Each I/O card (commonly referred to as a
blade) provides a media stream interface to the Private Network and a
media stream interface to the Public Network.
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Overview 9
Figure 5 Signaling and OAM interface - CPV5370 Host CPU
The rear transition module for the CP5370 Host Central Processing
Unit (CPU) card contains the following:
• COM2 port for connection to a terminal server and local monitor.
• Two Ethernet ports which provide connectivity to the Private
Network. The connection carries signaling and OAM data.
— The Ethernet 1 port is always used to provide an active
connection.
— The Ethernet 2 port provides a standby connection. The standby
ethernet function is enabled by default through the “Activate IP
Failover” property when configuring the RTP Media Portal. (See
These Ethernet connections carry the following:
• MGCP+ signaling to communicate with the SIP Application Module.
• operations, administration and maintenance (OAM) data to the
Management Module.
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Network interfaces on each of the Input/Output cards (MCPN765) in the
RTP Media Portal provide a path for media streams to/from the Private
Network and Public Network.
Figure 6 MCPN765 Media stream interface
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Overview 11
The RTP Media Portal uses the following input/output (I/O) cards:
• MCPN765 front card
• TM-PIMC-0101 rear transition module
The transition module contains two, 10/100 BaseT Ethernet
connections for RTP/RTCP/UDP media streams. Each pair of
MCPN765 and TM-PIMC-0101 cards perform the following functions:
• Provides connectivity for RTP/RTCP/UDP media streams to pass
between the Private Network and the Public Network, as well as the
public to public network.
• Relays media packets between end points.
• Performs Network Address and Port Translation (NAPT) functions.
NET ports
• NET1 port = IP address of Public Network
• NET2 port = IP address of Private Network
The RTP Media Portal Host CPU is only connected to the private
network. The RTP Media Portal is an edge component that is
dual-homed on the public network and the Private Network. It is the
Peripheral I/O cards that span these two distinct networks.
User interfaces
The System Management Console is used for fault and configuration
management of the RTP Media Portal. RTP Media Portal management
data is stored on both the Management Module and the Database
Module. The Management Module stores alarm, log, and OM data. The
Database Module stores configuration data.
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13
Upgrades
How this chapter is organized
This chapter is organized as follows:
OAM&P strategy
RTP Media Portal software upgrade
This section describes the update strategy for the RTP Media Portal.
The RTP Media Portal run-time sub-component can be upgraded by
deploying the new software to the target node from the System
Management Console.
Note: The SIP Application Module may try to contact the RTP Media
Portal while the upgrade is in progress, thus generating error logs. To
minimize impact to service, the RTP Media Portal should first be
SHUTDOWN so that it does not accept new service requests. While
shutting down, the RTP Media Portal is still processing established
media sessions. These pre-existing media sessions will slowly
become inactive as the calls end. The RTP Media Portal will
automatically transition into the LOCKED state when there are no
active media sessions present. When this occurs, it is safe to
proceed with the upgrade without affecting service.
Updating the software of the new run-time sub-component(s) from the
System Management Console can commence.
A reset is then issued to the RTP Media Portal from the System
Management Console. This reboots the host CPU, which in turn
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reboots the Peripheral CPUs. When the RTP Media Portal recovers
from the reset, it is running (UNLOCKED) with the upgraded software.
Note: It is possible to update one RTP Media Portal and reboot it
while the other half shelf is running the load that has not been
updated. Once one half shelf is updated, the other half shelf can be
locked, updated, and rebooted. Upgrading all RTP Media Portals
concurrently will cause a service outage.
The length of outage due to the reboot is approximately 3-5
minutes.
Note 1: Software loads are encrypted for security reasons.
Note 2: If a component upgrade fails, it does not roll back
automatically. A roll back prompt appears. If the upgrade is not
successful, note as much of the event as possible and contact your
next level of support.
Task flows
To avoid any problems with the SIP Application Module, the following
procedure describes the steps that must be followed when updating a
software load for the RTP Media Portal component.
From the System Management Console:
1
Shutdown the RTP Media Portal component. See “Shutdown the
2
Update the software load for the RTP Media Portal component.
Shutdown the RTP Media Portal component
The following procedure describes how to shutdown the RTP Media
Portal component:
From the System Management Console
1
2
3
Select the RTP Media Portal Server, select Components and
then select the appropriate RTP Media Portal component.
To Shutdown the component, either right-click and select
Shutdown or select Shutdown from the Operations menu.
The RTP Media Portal component will shutdown gracefully and
go into a LOCKED state, as seen in the General Information
Area of the System Management Console.
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Upgrades 15
Update a software load
The following procedure describes how to update a load for the RTP
Media Portal component:
From the System Management Console
1
Select the RTP Media Portal Server, select Components,
right-click the desired component and select Update.
Figure 7 Updating the RTP Media Portal from the menu tree
You can also launch the update from the pull-down
Configuration menu, as shown:
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Figure 8 Updating the RTP Media Portal from the pull-down menu
After selecting Update, the following window appears:
Figure 9 The update window, retrieving the load list
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Upgrades 17
2
You can only do an update from one version to another.
Note: The currently deployed software load will not appear in
the load list.
Figure 10 Load list for updating
3
4
Select the load version that should be used to update the RTP
Media Portal. Click on the Apply button.
The System Management Console displays the four tabs that
can be reconfigured. Modify any configuration values you need.
Note 1: Configuration fields ranges are detailed in the
Configuration section of this document.
Note 2: If an older version of the RTP Media Portal software
is deployed, it may not work with a newer version of the
components already installed. Administrators should upgrade
as per the release notes provided with each release.
5
6
Click on the Apply button.
Once the update is complete, the following window appears:
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Figure 11 Successful update dialog box
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19
Fault management
How this chapter is organized
This chapter is organized as follows:
Network fault management strategy
The system handles network fault management through the reporting
of alarms and logs. RTP Media Portal alarms and logs are viewed from
the System Management Console. (See the MCP System
Management Console Basics for further details related to alarms and
logs.)
Fault tolerance
The RTP Media Portal provides base capabilities that significantly
improve the performance and reliability of the system in the event of a
fault. These capabilities include:
•
Dynamic Pool Registration
— provides the basic mechanism that ensures resource availability
and utilization in the event of a SIP Application Module failure.
This function works in tandem with SIP Application Module
redundancy to ensure that RTP Media Portal resources continue
to be used in the event of a SIP Application Module failure. The
RTP Media Portal is configured to “pre-register” its availability
with the Standby SIP Application Module. This configuration
enables the Standby SIP Application Module to immediately
begin utilization of the RTP Media Portal for session requests
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whenever a failure condition occurs on the Active SIP
Application Module.
•
Idle Session Detection
— enables the RTP Media Portal to detect and recover media
resources associated with idle media sessions. This basic
capability enables the system to maintain capacity and
performance in the wake of a SIP Application Module failure that
causes the isolation of active media sessions.
•
•
Media Survivability
— enables the RTP Media Portal to allow media sessions to survive
(through to session completion) in the absence of control
signaling from the SIP Application Module. This capability
enables the system to permit media sessions to continue
through to completion in the wake of SIP Application Module
failure.
Shared Resource
— enables the distribution of RTP Media Portal resources to
multiple SIP Application Modules. The strategy of distributing
media sessions over multiple RTP Media Portals strengthens
the network's ability to continue processing sessions in the event
of a failure condition. Failures would result in diminished
capacity across the entire network, but not necessarily a service
outage, since there are many other RTP Media Portals available
to many SIP Application Modules.
Fault management procedures
Alarm surveillance
From the System Management Console
1
From the System Management Console, under the RTP Portal
Components folder, highlight the appropriate RTP Media Portal.
2
The main screen appears to the right and describes RTP Media
Portal component details such as general details, CPU usage,
Disk Usage, I/O Usage, and Alarms.
3
Below the status details, click the alarm tab to view the service
component and what severity of an alarm is raised against it. For
alarm severity classification, refer to the MCP System
Management Console Basics.
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Fault management 21
Figure 12 Example of viewing alarm information
Clearing an alarm
From the System Management Console
1
From the System Management Console, under the RTP Portal
Components folder, highlight the appropriate RTP Media Portal.
2
3
4
From the toolbar, select Tools, alarm browser.
An alarm table appears displaying the alarms.
Double click the alarm row. Information regarding the alarm and
necessary steps to clear the alarm appear in the information
screen at the bottom of the alarm window.
5
Follow the steps to clear the alarm.
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RTP Media Portal Alarms
The following section details how to clear certain alarms that affect the
RTP Media Portal. RTP Media Portal alarms are discussed in further
detail in the MCP System Management Console Basics.
Clearing the RTP101 Alarm (Blade out of service)
1
Verify that you can log in to the blade (card) from the host. If
successful, the private network connection is OK.
2
Once you are logged in to the blade, verify the blade can reach
the default gateway: Ping the gateway IP address from the
blade. If successful, the public network connection is OK.
3
Contact your next level of support with the results of these tests.
Clearing the RTP102 Alarm (RTP Media Portal Out of Service)
1
2
3
Verify that you can log in to the host. If successful, the private
network connection to the host is OK.
Once you are logged in to the host, verify that each of the
available blades is reachable (ping each blade).
Log in to a blade. Verify the blade can reach the default gateway:
Ping the gateway IP address from the blade. If successful, the
public network connection is OK.
4
5
Repeat for each blade.
Contact your next level of support with the results of these tests.
Clearing the RTP103 Alarm (Best Blade Selection)
1
Verify that you can log in to the blade (card) from the host. If
successful, the private network connection is OK.
2
Once you are logged in to the blade, verify the blade can reach
the default gateway: ping the gateway IP address from the
blade. If successful, the public network connection is OK.
3
4
Repeat for each blade.
Verify that the correct number of public/private ports have been
configured. Use the query tool in the System Management
Console.
5
Contact your next level of support with the result of these tests.
Clearing the RTP104 Alarm (Public Port Usage)
1
Wait for at least two audit cycles to see if the alarm is cleared
automatically. An audit cycle has a duration defined by the “Idle
Session Audit Period” property.
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Fault management 23
2
If the alarm persists, the number of available ports per blade
(card) and/or the number of blades (cards) in the system must
be increased. To increase the number of ports or the number of
blades, contact your next level of support.
Clearing the RTP105 Alarm (Private Port Usage)
1
Wait for at least two audit cycles to see if the alarm is cleared
automatically. An audit cycle has a duration defined by the “Idle
Session Audit Period” property.
2
If the alarm persists, the number of available ports per blade
(card) and/or the number of blades (cards) in the system must
be increased. The recommended maximum ports per blade is
300.
3
If it is not possible to increase the number of ports or the number
of blades, contact your next level of support.
Logs
System logs are discussed in detail in the MCP Management Module
Basics.
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25
Configuration management
How this chapter is organized
This chapter is organized as follows:
Network strategy
The network strategy is to configure all of the components in a central
location. The central location for configuration is the System
Management Console.
The following sections provide information on configuring the RTP
Media Portal.
Configuration procedures
Login to the System Management Console. For detailed procedures on
logging into the System Management Console, refer to the MCP
System Management Console Basics.
Adding the RTP Media Portal component
This procedure assumes that the server on which the RTP Media Portal
will be deployed, has already been configured. For example, Figure 13,
“Adding the RTP Media Portal component” on page 26 shows the RTP
Media Portal component being deployed onto the previously configured
server, “RTP Portal”.
From the System Management Console
1
To add the RTP Media Portal component, right-click on
Component under the Server definition and select Add >
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Figure 13 Adding the RTP Media Portal component
2
You will be prompted to choose a software load.
Figure 14 Software load list
3
Select the desired software load version for the RTP Media
Portal and click Apply.
4
5
You will be prompted to configure the RTP Media Portal.
Configure the RTP Media Portal properties as described in
configuration property details, place your cursor over the
property and a definition help box will pop up.)
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Configuration management 27
6
7
Enter a label in the Service Component Name field at the bottom
of the window and click Apply.
When deployment completes, there is a screen showing that the
component was added successfully.
Figure 15 Add successful dialog box
Configuration tabs and properties
The following figure shows the configurable properties of the System
Output Manager tab:
Figure 16 System Output Manager tab
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The following table details the configurable properties of the System
Output Manager tab:
Table 1 System Output Manager tab configurable properties
Configuration
Property
Format
Description
Send to File
Type: String
Name of file that
additional detailed
logs should be sent
to.
Range: Null, 1-500
characters
Default:
SystemOutLog
Number of Backup
Logfiles
Type: Integer
Range: N/A
Default: 10
Number of logfiles
that should be kept.
Maximum Size of a
Log File
Type: Integer (bytes) Maximum size of the
log file in bytes.
Range:
When this size is
200000-2147483647
reached, the log file
Default: 200000
is rotated.
The following figures show the configurable properties of the RTP
Media Portal tab:
Note: The configurable properties of the RTP Media Portal tab span
more than one page and so, are shown in the next four figures.
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Configuration management 29
Figure 17 RTP Media Portal tab (1 of 4)
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Figure 18 RTP Media Portal tab (2 of 4)
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Configuration management 31
Figure 19 RTP Media Portal tab (3 of 4)
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Figure 20 RTP Media Portal tab (4 of 4)
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Configuration management 33
The following table details the configurable properties of the RTP Media
Portal tab:
Table 2 RTP Media Portal tab configurable properties
Configuration
Property
Format
Description
Call Legs
Domain
Type: String
Controls the number of
simultaneous transactions.
Range: 4096-MaxInt
Default: 4096
Type: String
Domain in which the RTP Portal will
operate.
Range: 1-20
characters
For future use.
Default: For future
use
RTP Portal IP
AppSvr IP
Type: String
Private IP Address of the RTP
Media Portal host. Identifies a
specific host.
Range: 7-15
characters
Default: 0.0.0.0
Note: This value must be unique.
Type: String
Private IP Address of SIP
Application Module to which this
portal is assigned.
Range: 7-15
characters
Default: 0.0.0.0
Note: In a redundant configuration,
the value for this property must be
set to the private static address of
each SIP Application Module in the
network.
Port
Type: String
Port on which the SIP Application
Module is listening for MGCP+
messaging from the media portal. It
must match the associated setting
on the SIP Application Module.
Range: 1025-65535
Default: 3903
Note: The use of the default value
for this property is highly
recommended.
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Table 2 RTP Media Portal tab configurable properties
Discovery Probe
Time Period
Type: String
Controls the frequency (in
milliseconds) of registration
messages (RSIPs) sent from the
RTP Media Portal to the SIP
Application Module in the absence
of MGCP+ messaging from the SIP
Application Module.
Range: 0-3600000
Default: 60000
Host Receive Port
Polltimer Delay
Type: String
Port on which the RTP Media Portal
listens for MGCP+ messaging from
the SIP Application Module.
Range: 1025-65535
Default: 3904
Note: The use of the default value
for this property is highly
recommended.
Type: String
Time span (in milliseconds) required
for startup and initialization of the
cards. The host CPU waits this
period of time before attempting to
contact the cards. (This is how long
the host waits to talk to the cards to
ask if they are up yet.)
Range: 0-65535
Default: 20000
milliseconds
Note: The use of the default value
for this property is highly
recommended.
Polltimer Interval
Type: String
Interval (in milliseconds) at which
the host polls the blades to ensure
they are still available. (Intermediate
checks just to make sure the blade
is still up.)
Range: 0-65535
Default: 65000
milliseconds
Note: The use of the default value
for this property is highly
recommended.
Minor Port Usage
Alarm Level
Type: Percent
Range: 0-100
Default: 50
The percent usage at which the
number of ports used on the public
or private side of an RTP Media
Portal (over all blades) causes a
minor alarm.
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Configuration management 35
Table 2 RTP Media Portal tab configurable properties
Major Port Usage
Alarm Level
Type: Percent
Range: 0-100
Default: 80
The percent usage at which the
number of ports used on the public
or private side of an RTP Media
Portal (over all blades) causes a
major alarm.
Critical Port Usage
Alarm Level
Type: Percent
Range: 0-100
Default: 90
The percent usage at which the
number of ports used on the public
or private side of an RTP Media
Portal (over all blades) causes a
critical alarm.
Private Netmask
Public Netmask
Default Gateway
Type: IP address
Range: N/A
The Private Network Mask is used
for routing on the Private network.
Default:
255.255.255.0
(Default gateways
are for the cards,
not for the host.)
Type: IP address
Range: N/A
The Public Network Mask is used for
routing on the Public network.
Default:
255.255.255.0
(Default gateways
are for the cards,
not for the host.)
Type: IP Address
Range: N/A
The Default Gateway is the gateway
router to the rest of the world (the
default route).
Default: 0.0.0.0
Note: If this value is not filled in, the
RTP Media Portal will fail to provide
service. The RTP Media Portal will
not provide service unless the
blades can communicate with the
specified Default Gateway.
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Table 2 RTP Media Portal tab configurable properties
Chassis #
Type: String
Range: 0-255
Default: 1
Chassis identifier used to identify a
specific CPX8216T chassis. This
information is used by configuration
scripts to synchronize RTP Media
Portal configuration across multiple
CX8216T chassis. Must be unique
per chassis. Must match the
Chassis # assigned to the blades
during the staging of the portal.
Idle Session Audit
Period
Type: String
The period of the audit that runs to
detect idle media sessions on the
Peripheral CPU (Blade).
Range: 0-3600000
Default: 300000 (ms)
Long Idle Duration
Long Call Duration
Type: String
Range: 0-65535
Default: 24
This represents the maximum
amount of time that a RTP Media
Portal resource may remain validly
idle. This has units of number of
IdleSessionAuditPeriods.
Type: String
This represents the maximum
amount of time that an RTP Media
Portal resource may remain active
in a media session. This has units of
number of Idle Session Audit
Periods.
Range: 0-65535
Default: 576
Public Network
Detection Period
Type: String
The period of the audit that runs to
detect the Public network interface
on the Peripheral CPU (Blade). This
has units of milliseconds. If the
value is set to zero, then the audit is
disabled.
Range: 0-3600000
Default: 15000
PND Timeout
Type: String
The amount of time that the Public
Network Detection algorithm will
wait for a response to a query sent
to the default gateway. This has
units of milliseconds. If the value is
zero, no query will be made to the
default gateway.
Range: 0-10000
Default: 250
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Configuration management 37
Table 2 RTP Media Portal tab configurable properties
Static RTP Ports
Type: Boolean
Range: true/false
Default: false
Boolean indicating whether the RTP
Media Portal should perform static
fixed port allocation/management,
or dynamic randomized port
allocation/management.
Note: When this parameter is
selected, the Blade's configuration
parameter "Number Ports" is
disregarded and all ports in the
range from “Min Port Value” to “Max
Port Value” are allocated for usage.
All even-numbered ports in the
specified range are used for RTP
streams and the odd-numbered
ports are used for RTCP streams.
Activate IP Failover
Type: Boolean
Range: true/false
Default: true
Enables the RTP Media Portal Host
CPU to monitor the status of the
Private network Interface and react
accordingly. This basic capability
enables the system to maintain
service availability in the wake of
Private network failures. Whenever
an RTP Media Portal Host CPU
detects that it is having problems
with its Private network interface,
the Host switches to another
available Private network interface.
Note: There are two tests
associated with the activation of
Host IP Failover: a carrier sense test
and an optional network (ping) test.
Upon activation of Host IP failover,
the carrier sense test is
automatically provided. Enabling of
the optional network test is
controlled by the “Activate IP
Failover NW Test” configuration
parameter. Enabling the optional
network test will generate a periodic
ping to the default gateway on the
private network which was
configured during installation and
commissioning.
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Table 2 RTP Media Portal tab configurable properties
Activate IP Failover
NW Test
Type: Boolean
Range: true/false
Default: false
This configuration parameter is
associated with the “Activate IP
Failover” configuration parameter.
Please refer to Note in description
of the “Activate IP Failover”
configuration parameter for details.
Public IP
Type: IP Address
The Public IP address of this
particular blade. Repeated for each
blade.
Range: 7-15
characters
Default: 0.0.0.0
Private IP
Type: IP Address
The Private IP address for this
particular Blade. Repeated for each
Blade.
Range: 7-15
characters
Default: 0.0.0.0
Number Ports
Type: Positive
Integer
Number of ports (this many private
and this many public) configured on
this blade. Controls maximum
allowable simultaneous media
streams permitted on this particular
Blade. Repeated for each Blade.
Range: 0-65535
Default: 20
Blade Name
Type: Text
String describing this particular
Blade. Repeated for each Blade.
Range:
blade1-blade16
Note: This field is not configurable.
Default: blade1,
blade 2, etc.
Min Port Value
Max Port Value
Type: Positive
Integer
Minimum port range value.
Range: 0-65535
Default: 40000
Type: Positive
Integer
Maximum port value.
Range: 0-65535
Default: 60000
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39
Accounting management
Strategy
The RTP Media Portal does not perform any accounting management.
For more information on accounting, see the MCP Accounting Module
Basics.
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Performance management
Strategy
RTP Media Portal performance is monitored through the System
Management Console GUI by viewing Operational Measurements.
Refer to the MCP System Management Console Basics for information
on OMs and viewing OMs.
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43
Security and Administration
How this chapter is organized
This chapter is organized as follows:
Security strategy overview
One function of the RTP Media Portal is to secure the media interface
to the private network. Securing the media layer is achieved through a
combination of methods at the network level and RTP Media Portal
component level.
Network level security functions
At the network level, media layer security is achieved by the
randomization of the IP addresses/ports used for multimedia sessions
and utilization of NAPT (Network Address Port Translation) technology
to obscure the network topology of the private network.
Blade (IP address) randomization
When a multimedia session requests resources, the RTP Media Portal
selects an appropriate blade to host the session. Blade selection
determines the specific IP address that will be made available to the
media streams for the session.
During the selection of a blade, the port usage of each blade is queried
to determine the number of available ports for each. The blade which
has the most available ports is selected. This method of selection
provides randomization and helps distribute the session load across
the blades.
Port randomization
When the RTP Media Portal is deployed, each blade is assigned a pool
of ports with a specific number of ports in a specific range based on
configuration data (Number Ports, Min Port Value, Max Port Value,
respectively). For more information on these configuration properties,
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As multimedia sessions are initiated, a port is chosen from the port pool
associated with the selected blade. When a multimedia session
completes, their associated ports are deallocated from the pool and
new replacement ports are allocated to the pool. The deallocation of
used ports and allocation of replacement ports provides randomization
in the port pools for the blades.
NAPT function
In order to obscure the private network topology, the RTP Media Portal
uses the NAPT functionality to secure the multimedia sessions so that
there is no leakage of topology information.
This is achieved by maintaining a list of media ports (NAPT table) which
are being used within active multimedia sessions. Only packets which
arrive on these active ports are processed. Packets which arrive on
non-active ports are rejected and logged as potential problems.
RTP Media Portal component level security functions
The RTP Media Portal component also contributes to system security
by opening and closing media ports only in response to requests from
the SIP Application Module (which has pre-authenticated such
requests) and by rejecting any unauthorized packets on an active
connection.
Authenticated requests
All requests to manipulate the media resources on the RTP Media
Portal originate from the SIP Application Module. The SIP Application
Module ensures that all requests are made by, or made to, a valid
service subscriber. In this way, the SIP Application Module effectively
authenticates all requests.
In addition, the portion of the RTP Media Portal which processes these
requests to manipulate the media resources resides safely within the
private network.
Packet filter/firewall
As packets are received from the public network, the RTP Media Portal
analyzes each packet to ensure the following:
• the data format is RTP/RTCP/UDP (as indicated by the session
description). All other packet types are discarded and logged as
problems.
• the source/destination addresses match the expected
source/destination addresses indicated in the session description.
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Security and Administration 45
Packets that do not have a matching source/destination address are
discarded and logged as potential problems.
• the source/destination ports match the expected source/destination
ports indicated in the session description. Packets that do not have
a matching source/destination port are discarded and logged as
potential problems.
User administration
Basic administrative tasks for the RTP Media Portal are covered in the
Upgrade, Configuration, and Fault sections of this document. Other
basic administrative tasks related to the System Management Console
are covered in the MCP System Management Console Basics.
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Succession Multimedia Communications Portfolio
MCP RTP Media Portal
Basics
Copyright © 2003 Nortel Networks,
All Rights Reserved
NORTEL NETWORKS CONFIDENTIAL: The information contained in this document is the
property of Nortel Networks. Except as specifically authorized in writing by Nortel Networks, the holder of
this document shall keep the information contained herein confidential and shall protect same in whole or in
part from disclosure and dissemination to third parties and use same for evaluation, operation, and mainte-
nance purposes only. Changes or modifications to the MCP RTP Media Portal without the express consent
of Nortel Networks may void its warranty and void the user’s authority to operate the equipment.
Information is subject to change without notice. Nortel Networks reserves the right to make changes in
design or components as progress in engineering and manufacturing may warrant.
*Nortel Networks, the Nortel Networks logo, the Globemark, UNIStim, MCP, Nortel, Northern Telecom, and
NT, are trademarks of Nortel Networks.
Publication number: NN10035-111
Product release: MCP 1.1 FP1 Standard
Document release: Standard MCP 1.1 FP1 (02.02)
Date: April 2003
Printed in the United States of America.
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