Global SIP Settings
41-001343-02 REV05 – 07.2014 4-76
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 mul-
tiple 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-WB (G.722.2) Codec Modes
AMR Mode Bit-Rate (kbps)
04.75
15.15
25.90
36.70
47.40
57.95
610.2
712.2
AMR-WB Mode Bit-Rate (kbps)
06.60
18.85
2 12.65
3 14.25
4 15.85
5 18.25
6 19.85
7 23.05
8 23.85
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