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Overview
This best practice provides guidance on configuring AMR/AMR-WB options from EMA in support of a Multimedia Telephony Service for IMS (MTSI) service as described on the page AMR and RTCP Enhancements..
This configuration is performed either on ePSX/PSX or on SBC ERE. Make sure you have the correct version of ePSX installed on SBC. This configuration can be performed both through SBC EMA and SBC CLI. For additional ePSX configuration details via EMA, see Call Routing: System Provisioning - ePSX.
Procedure
SBC ERE Configuration
% set profiles media codecEntry G711-DEFAULT codec amrBandwidthEfficient initialCodecMode enable
% set profiles media codecEntry G711-DEFAULT codec amrwbOctetAligned initialCodecMode enable
% set profiles media codecEntry G711-DEFAULT codec amrOctetAligned initialCodecMode enable
% set profiles media codecEntry G711-DEFAULT codec amrwbBandwidthEfficient initialCodecMode enable
Note
The Initial Codec Mode
flag is supported by the following AMR/AMRWB codecs:
- amrBandwidthEfficient
- amrOctetAligned
- amrwbBandwidthEfficient
- amrwbOctetAligned
PSX/ePSX Configuration (from EMA)
On the SBC EMA main screen, navigate to Configuration > System Provisioning > Category: Call Routing > E PSX. The PSX manager window is displayed.
In the PSX Manager window, choose Codec Entry from the fourth drop-down box.
Choose the appropriate Codec Entry list item from the list which has the AMR/AMR-WB Options.
Once the Codec Entry list item is selected, the AMR-WB Options are visible.
The following parameters are displayed:
AMR/AMR-WB Codec Options parameters
Parameter | Length/Range | Default | Description |
---|
Mode Change Neighbor | NA | NA | This flag restricts the mode change of an AMR/AMR-WB to the neighboring modes in the Active Codec Mode set. Neighboring modes are the ones closest in bit rate to the current mode, either the next higher or next lower rate. If checked, the Egress offer/Ingress answer from SBC sets the Mode-Change-Neighbor value to 1.
If unchecked, change between any two modes in the Active Codec Mode set is allowed. |
Initial Codec Mode as per 3GPP 26.114 | NA | NA | This flag determines what is the initial codec mode of AMR/AMR-WB transcoded call, once the call is established. If unchecked, AMR/AMR-WB call starts with the highest rate in the active mode set. If checked, AMR/AMR-WB call starts with a rate determined by the following algorithm: If 1 codec mode is included in the mode-set, it should be the initial codec mode. If 2 or 3 codec modes are included in the mode-set, the initial codec mode should be the codec mode with the lowest rate. If 4 or more codec modes are included in the mode-set, the initial codec mode should be the codec mode with the second lowest rate. |
By default, all the options of AMR-WB Mode Set are checked. To run the calls in a restricted AMR-WB Mode set, uncheck the modes that are not required in the Active Mode Set.
AMR-WB Codec Options for Restricted Mode Set
To run the calls in an unrestricted AMR-WB Mode set, select all the mode sets.
AMR-WB Codec Options for Unrestricted Mode Set
- Click Save to save the configuration.