Aastra Telecom 41-001343-02 AMR Codec Modes, AMR-WB G.722.2 Codec Modes, AMR Mode Bit-Rate kbps

Global SIP Settings

Optional parameters have also been created to configure this feature. Administrators can enable the feature by using the “sip amr codec payload format”, which specifies the payload format for AMR/AMR-WB. AMR/AMR-WB can operate in either bandwidth-efficient mode (0) or in octet-aligned mode (1), depending on the value configured. Administrators can also disable the octet-align mode and still send the octet-align:0 header in the Session Description Protocol (SDP) by using value (2) for the parameter. By default, the IP phones utilize bandwidth-efficient mode.

Administrators can also specify the list of mode sets that the IP phones support and state the preferred mode to use if multiple modes are supported by both sides, using the “sip amr codec mode set” and/or the “sip amr wb codec mode set” parameters. If no modes are defined then all codec modes are allowed for the payload type.

The following tables list the AMR/AMR-WB codec modes and corresponding bit-rates.

AMR Codec Modes

AMR Mode	Bit-Rate (kbps)
0	4.75
1	5.15
2	5.90
3	6.70
4	7.40
5	7.95
6	10.2
7	12.2

AMR-WB (G.722.2) Codec Modes

AMR-WB Mode	Bit-Rate (kbps)
0	6.60
1	8.85
2	12.65
3	14.25
4	15.85
5	18.25
6	19.85
7	23.05
8	23.85

4-76 41-001343-02 REV04 – 05.2014