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Overview

This best practice provides guidance on configuring 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 on ePSX/PSX and not on SBC ERE. Make sure you have the correct version of ePSX installed on SBC. This configuration can only be performed through SBC EMA, not through SBC CLI. For additional ePSX configuration details via EMA, see Call Routing: System Provisioning - ePSX.

Procedure

 

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

    PSX Main Window



  2. In the PSX Manager window, choose Codec Entry from the fourth drop-down box.

    AMR-WB Codec Entry



  3. Choose the appropriate Codec Entry list item from the list which has the AMR/AMR-WB Options.

    AMR-WB Codec Item



  4. Once the Codec Entry list item is selected, the AMR-WB Options are visible.

    AMR-WB Codec options


    The following parameters are displayed:

     

    AMR/AMR-WB Codec Options parameters

    ParameterLength/RangeDefaultDescription
    Mode Change NeighborNANA

    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 26.114NANA

    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.



  5. 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



  6. To run the calls in an unrestricted AMR-WB Mode set, select all the mode sets.

    AMR-WB Codec Options for Unrestricted Mode Set



  7. Click Save to save the configuration.

 

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