3Com V7122 User Manual page 199

ini File Field Name
Web Parameter Name
V7122 Gateway User Guide
Valid Range and Description
The coder name is case-sensitive.
If silence suppression is not defined (for a specific coder), the
value defined by the parameter EnableSilenceCompression is
used.
The value of several fields is hard-coded according to well-
known standards (for example, the 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.
Only the ptime of the first coder in the defined coder list is
declared in INVITE / 200 OK SDP, even if multiple coders are
defined.
If the coder G.729 is selected and silence suppression is
enabled (for this coder), the gateway 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.
Both GSM-FR and MS-GSM coders use Payload Type = 3.
Using SDP, it isn't possible to differentiate between the two.
Therefore, it is highly recommended not to select both coders
simultaneously.
This parameter (CoderName_ID) can appear up to 20 times
(five coders in four coder groups).
For example:
CoderName_1 = g711Alaw64k,20,,,0
CoderName_1 = g711Ulaw64k,40
CoderName_1 = g7231,90,1,,1
CoderName_2 = g726,$$,2,,0
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