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Overview

This best practice provides guidance on configuring RTCP RR/RS Bandwidth modifiers from EMA to support held calls for a Multimedia Telephony Service for IMS (MTSI) environment as described on the page AMR and RTCP Enhancements..

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SBC ERE Configuration

Configuring Packet Service Profile in ERE

Execute the following command to configure PSP:

% set profiles media packetServiceProfile DEFAULT rtcpOptions rtcp enable

Enabling RTCP for HELD Calls

Execute the following command to configure the HELD calls:

% set profiles media packetServiceProfile DEFAULT rtcpOptions rtcp enable enableRTCPForHeldCalls enable

Configuring RR and RS Bandwidth Values

Execute the following command to configure RR and RS bandwidth values:

% set profiles media packetServiceProfile DEFAULT rtcpOptions rtcp enable enableRTCPForHeldCalls enable rrBandwidth 250 rsBandwidth 250

Configuring IP Signaling Profile

Execute the following command to send the RR and RS bandwidth information in the SDP offer:

% set profiles signaling ipSignalingProfile DEFAULT_SIP commonIpAttributes flags sendRTCPBandwidthInfo enable

PSX/ePSX Configuration (from EMA)

Configure Packet Service Profile on ePSX/PSX

1. On the SBC EMA main screen, navigate to Configuration > System Provisioning > Category: Call Routing > E PSX. The PSX manager window is displayed.

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   0 Figure 1 PSX Main Window

2. In the PSX Manager window, choose Packet Service Profile from the fourth drop-down menu.

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   0 Figure 1 PSX - Packet Service Profile

   Choose the appropriate name of the Packet Service Profile configured to support RTCP from the sub-menu.

3. To create Packet Service Profile, right click on the Selection Area.

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   0 Figure 1 Selection Area
   Image Added

   A pop-up menu appears. Select New from the pop-up menu.
   
   

4. The Packet Service Profile window appears. Provide the Packet Service Profile name.

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   0 Figure 1

   PSX -

   Packet Service Profile

   - Sub Fields

   Image Modified

   Scroll down the display window to locate RTCP option.

5. Choose the RTCP option to enable it. This action enables the RTCP configurable flags.

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   0 Figure 1 PSX RTCP - Fields
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   The following parameters are displayed:

   Info
   All available parameters require RTCP to be enabled.

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   0 Table 1 PSX RTCP - Fields parameters 3 PSX RTCP - Fields parameters
   Parameter Length/Range Default Description RTCP NA  Disabled When selected, this option enables Real-time Transport Control Protocol (RTCP) for the channel. RTCP is used to report traffic congestion data. Packet Loss Threshold (Packets Lost/100,000 Packets) NA 0 The packet loss threshold, measured in number of packets lost per 100,000 packets. RR Bandwidth 100-4000 250 The RTCP bandwidth allocated to active data senders. RS Bandwidth 100-3000 250 The RTCP bandwidth allocated for receivers. Packet Loss Action NA None The action to take when the packet loss threshold is exceeded on the channel. Possible actions are: None—No action. Trap—Generate an SNMP trap. Trap and Disconnect—Generate an SNMP trap and disconnect the call. Trap and Adapt—(applies to GSX only) Generate an SNMP trap and invoke an adaptation mechanism. Enable RTCP Only For HELD Calls NA Disabled If this parameter is enabled, SBC ignores the configured RR/RS values in the Packet Service Profile and send RR/RS = 0 in the offer/answer and disables RTCP when the call is active. When the call is HELD, and a RE-INVITE is sent,  the CPN (SBC) uses the configured values in the Packet Service Profile for RTCP bandwidth and enables RTCP. When the call is RESUMED, the CPN (SBC) again disables RTCP by sending RR/RS=0 in the RE-INVITE. If disabled the older behavior of SBC is applicable. Termination For Pass-Through Calls NA NA When enabled, RTCP is terminated and generated locally even for pass-through calls.

6. Make the desired changes to these parameters.

7. Click Save to save the configuration.

Configure IP Signaling Profile on ePSX/PSX

1. On the SBC EMA main screen, go navigate to Configuration > System Provisioning > Category: Call Routing > E PSX. The PSX manager window is displayed.

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   0 Figure 1 PSX Main Window

   
   
   

2. In the PSX Manager window, choose IP Signaling Profile from the fourth drop-down menu.

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   0 Figure 1 PSX Codec - IP Signaling Profile

   
   
   

3. To create IP Signaling Profile, right click on the Selection Area.

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   0 Figure 1 Selection Area
   Image Added

   
   A pop-up menu appears. Select New from the pop-up menu.
   
   

4. The IP Signaling Profile window appears. Provide the IP Signaling Profile name.

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   0 Figure 1 IP Signaling Profile
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   Scroll down the display window to locate Common IP Attributes - Communicating With The Peer Regardless Of Call Direction section.
   
   

5. Enable the "Send RTCP Bandwidth Info" flag identified in the screen capture below:

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   0 Figure 1 PSX IP Signaling Profile - Fields

   
   The following flag is now enabled:

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   0 Table 1 PSX IP Signaling Profile - Fields parameter
   Parameter Length/Range Default Description Send RTCP Bandwidth Info NA NA When this flag is enabled, the RR,RS bandwidth information, b=RR: and b=RS: is sent in the SDP offer.

6. Click Save to save your changes.

To enable SBC to use rules to determine the initial codec mode (applicable for AMR and AMR-WB codecs):

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