Version 6.2 403 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
G.711A-
law_VBD
[g711AlawVbd]
10, 20 (default), 30,
40, 50, 60, 80, 100,
120
Always
64
Dynamic (0-
127)
N/A
G.711U-
law_VBD
[g711UlawVbd]
10, 20 (default), 30,
40, 50, 60, 80, 100,
120
Always
64
Dynamic (0-
127)
N/A
EG.711 A-law
[eg711Alaw]
10 (default), 20, 30 Always
64
Dynamic
(96-127)
N/A
EG.711 U-law
[eg711Ulaw]
10 (default), 20, 30 Always
64
Dynamic
(96-127)
N/A
G.722
[g722]
20 (default), 40, 60,
80, 100, 120
64
(default)
Always 9 N/A
G.723.1
[g7231]
30 (default), 60, 90 5.3 [0]
(default),
6.3 [1]
Always 4 Disable [0]
Enable [1]
G.726
[g726]
10, 20 (default), 30,
40, 50, 60, 80, 100,
120
16 [0]
(default),
24 [1], 32
[2], 40 [3]
Dynamic (0-
127)
Default is 23
Disable [0]
Enable [1]
G.727 ADPCM 10, 20 (default), 30,
40, 50, 60, 80, 100,
120
16, 24,
32, 40
Dynamic (0-
127)
Disable [0]
Enable [1]
G.729
[g729]
10, 20 (default), 30,
40, 50, 60, 80, 100
Always 8 Always 18 Disable [0]
Enable [1]
Enable w/o
Adaptations [2]
T.38
[t38fax]
N/A N/A N/A N/A
Notes:
The coder name is case-sensitive.
Each coder type can appear only once per Coder Group.
Only the packetization time of the first coder in the defined coder list is
declared in INVITE/200 OK SDP, even if multiple coders are defined.
The device always uses the packetization time requested by the remote
side for sending RTP packets. If not specified, the packetization time is
assigned the default value.
The value of several fields is hard-coded according to common standards
(e.g., payload type of G.711 U-law is always 0). Other values can be set
dynamically. If no value is specified for a dynamic field, a default value is
assigned. If a value is specified for a hard-coded field, the value is
ignored.
If silence suppression is not defined for a specific coder, the value defined
by the parameter EnableSilenceCompression is used.
If G.729 is selected and silence suppression is enabled (for this coder),
the device includes the string 'annexb=no' in the SDP of the relevant SIP
messages. If silence suppression is set to 'Enable w/o Adaptations',
'annexb=yes' is included. An exception is when the remote device is a
Cisco gateway (IsCiscoSCEMode).
The coder G.722 provides Packet Loss Concealment (PLC) capabilities,
ensuring higher voice quality.
A Coder Group can be assigned to an IP Profile (using the IPProfile
parameter) and/or to a Tel Profile (using the TelProfile parameter).
For an explanation on V.152 support (and implementation of T.38 and
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