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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.

To check the license information, execute the following command:

> show table system licenseInfo

SBC ERE Configuration

Creating Codec Entry

set profiles media codecEntry AMRWB-DEFAULT

Configuring AMR Codec Entry

set profiles media codecEntry AMRWB-DEFAULT codec amrBandwidthEfficient activeCodecSet AMR-0-4.75kbps

set profiles media codecEntry AMRWB-DEFAULT codec amrOctetAligned activeCodecSet AMR-0-4.75kbps

Configuring AMR-WB Codec Entry

set profiles media codecEntry AMRWB-DEFAULT codec amrwbBandwidthEfficient modeSet AMR-1-8.85

set profiles media codecEntry AMR-WB codec amrwbOctetAligned modeSet AMR-0-6.6

PSX Configuration

AMR-WB

Configuration

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

   Caption
   0 Figure 1 AMR-WB Codec Entry

2. To create AMR-WB codec, right click on the Selection Area.

   Include Page
   initialCodecMode_limitation initialCodecMode_limitation

   Caption
   0 Figure 1 Selection Area

   
   
   Select New from the resultant pop-up menu.

3. The Codec Entry window displays. Provide the Codec Entry name.

   To configure AMR WB-Bandwidth Efficient codec, select G.722.2 (AMRWB-Bandwidth Efficient) from the Audio Encoding drop-down list.

   Caption
   0 Figure 1 AMR WB-Bandwidth Efficient Codec

   or

4. To configure AMR WB-Octet Aligned codec, select G.722.2 (AMRWB-Octet Aligned) from the Audio Encoding drop-down list.

   Caption
   0 Figure 1 AMR WB-Octet Aligned Codec

5. Once the Audio Encoding is selected, the AMR-WB Options are visible.

   Caption
   0 Figure 1 AMRWB Options

   
   The following parameters are displayed:

   Caption
   0 Table 1 AMR-WB Codec Options parameters
   Parameter Description Mode Change Neighbor This flag restricts the mode change of an 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 This flag determines what is the initial codec mode of AMR-WB transcoded call, once the call is established. If unchecked, AMR-WB call starts with the highest rate in the active mode set. If checked, 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.

6. 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.

   Caption
   0 Figure 1 AMR-WB Codec Options for Restricted Mode Set

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

   Caption
   0 Figure 1 AMR-WB Codec Options for Unrestricted Mode Set

8. Click Save.

AMR Configuration

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

   Caption
   0 Figure 1 PSX Main Window

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

   Caption
   0 Figure 1 AMR-WB Codec Entry

3. To create AMR codec, right click on the Selection Area.

   Include Page
   initialCodecMode_limitation initialCodecMode_limitation

   Caption
   0 Figure 1 Selection Area

   
   Select New from the resultant pop-up menu.

4. The Codec Entry window displays. Provide the Codec Entry name.

5. Next, either configure AMR Bandwidth Efficient or Octet Aligned codec.

   1. To configure AMR Bandwidth Efficient codec, select AMR Bandwidth Efficient from the Audio Encoding drop-down list.
       

      Caption
      0 Figure 1 AMR Bandwidth Efficient Codec

   2. To configure AMR Octet Aligned codec, select AMR Octet Aligned from the Audio Encoding drop-down list.

      Caption
      0 Figure 1 AMR Octet Aligned Codec

6. Once the Audio Encoding type is selected, observe the displayed AMR options.
   

   Caption
   0 Figure 1 AMR Codec Options

   
   The following parameters are displayed:

   Caption
   0 Table 1 AMR Codec Options parameters
   Parameter Description Mode Change Neighbor This flag restricts the mode change of an AMR 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 This flag determines what is the initial codec mode of AMR transcoded call, once the call is established. If unchecked, AMR call starts with the highest rate in the active mode set. If checked, AMR 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.

7. By default, all the options of AMR Mode Set are checked. To run the calls in a restricted AMR Mode set, uncheck the modes that are not required in the Active Mode Set.

   Caption
   0 Figure 1 AMR Codec Options for Restricted Mode Set

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

   Caption
   0 Figure 1 AMR Codec Options for Unrestricted Mode Set

9. Click Save to save the configuration.