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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.
The license must be configured before configuring AMR/AMR-WB codec entry.
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
Note
The Initial Codec Mode
flag is supported by the following AMR/AMRWB codecs:
- amrBandwidthEfficient
- amrOctetAligned
- amrwbBandwidthEfficient
- amrwbOctetAligned
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/ePSX Configuration (from EMA)
AMR-WB Configuration
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.
To create AMR-WB codec, right click on the Selection Area.
Note
The Initial Codec Mode
flag is supported by the following AMR/AMRWB codecs:
- amrBandwidthEfficient
- amrOctetAligned
- amrwbBandwidthEfficient
- amrwbOctetAligned
A pop-up menu appears. Select New from the pop-up menu.The Codec Entry window appears. 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.
AMR WB-Bandwidth Efficient Codec
orTo configure AMR WB-Octet Aligned codec, select G.722.2 (AMRWB-Octet Aligned) from the Audio Encoding drop-down list.
AMR WB-Octet Aligned Codec
Once the Audio Encoding is selected, the AMR-WB Options are visible.
The following parameters are displayed:
AMR-WB Codec Options parameters
Parameter | Length/Range | Default | Description |
---|
Mode Change Neighbor | NA | NA | 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 | NA | NA | 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. |
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.
AMR Configuration
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.
To create AMR codec, right click on the Selection Area.
Note
The Initial Codec Mode
flag is supported by the following AMR/AMRWB codecs:
- amrBandwidthEfficient
- amrOctetAligned
- amrwbBandwidthEfficient
- amrwbOctetAligned
A pop-up menu appears. Select New from the pop-up menu.The Codec Entry window appears. Provide the Codec Entry name.
To configure AMR Bandwidth Efficient codec, select AMR Bandwidth Efficient from the Audio Encoding drop-down list.
AMR Bandwidth Efficient Codec
orTo configure AMR Octet Aligned codec, select AMR Octet Aligned) from the Audio Encoding drop-down list.
Once the Audio Encoding is selected, the AMR Options are visible
The following parameters are displayed:
AMR Codec Options parameters
Parameter | Length/Range | Default | Description |
---|
Mode Change Neighbor | NA | NA | 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 | NA | NA | 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. |
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.
AMR Codec Options for Restricted Mode Set
To run the calls in an unrestricted AMR Mode set, select all the mode sets.
AMR Codec Options for Unrestricted Mode Set
- Click Save to save the configuration.