Global SIP Settings
4-76 41-001343-02 REV04 – 05.2014
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-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
