Version 5.8 107 September 2009
SIP User's Manual 3. Web-Based Management
3.3.4.4.2 Configuring Coder Groups
The 'Coder Group Settings' page provides a table for defining up to four different coder
groups. These coder groups are used in the 'Tel Profile Settings' and 'IP Profile Settings'
pages to assign different coders to Profiles. For each coder group, you can define up to five
coders, where the first coder (and its attributes) in the table takes precedence over the
second coder, and so on. The first coder is the highest priority coder and is used by the
device whenever possible. If the far end device cannot use the coder assigned as the first
coder, the device attempts to use the next coder and so on.
Notes:
• For a list of supported coders, refer to the ini file parameter table
CoderName, described in ''SIP Configuration Parameters'' on page 252.
You can also configure the Coders table using this parameter.
• Each coder type can appear only once per Coder Group.
• The device always uses the packetization time requested by the remote
side for sending RTP packets. If not specified, the packetization time
(ptime) is assigned the default value.
• 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.
• For G.729, you can also select silence suppression without adaptations.
• If silence suppression is enabled for G.729, 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).
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