Global SIP Settings
41-001343-02 REV05 – 07.2014
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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)
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 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