Version 6.2 119 February 2011
SIP User's Manual 3. Web-Based Management
5. In the 'Payload Type' field, if the payload type (i.e., format of the RTP payload) for the
selected coder is dynamic, enter a value from 0 to 120 (payload types of 'well-known'
coders cannot be modified).
6. From the 'Silence Suppression' drop-down list, enable or disable the silence
suppression option for the selected coder.
7. Repeat steps 2 through 6 for the next optional coders.
8. Click the Submit button to save your changes.
9. To save the changes to flash memory, see ''Saving Configuration'' on page 169.
Notes:
• A coder (i.e., 'Coder Name') can appear only once in the table.
• If packetization time and/or rate are not specified, the default value is
applied.
• Only the packetization time of the first coder in the 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.
• For G.729, it's also possible to select silence suppression without
adaptations.
• If the coder G.729 is selected with silence suppression is disabled, the
device includes 'annexb=no' in the SDP of the relevant SIP messages. If
silence suppression is enabled or set to 'Enable w/o Adaptations',
'annexb=yes' is included. An exception to this logic is when the remote
gateway is a Cisco device (IsCiscoSCEMode).
3.3.2.7.2 Configuring Coder Groups
The 'Coder Group Settings' page allows you to define up to four different Coder Groups.
These Coder Groups can be assigned to Tel Profiles (see Configuring Tel Profiles on page
121)
and/or IP Profiles (see Configuring IP Profiles on page 122). For each Coder Group,
you can define up to ten coders, where the first coder 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 first coder, the device
attempts to use the next coder, and so on.
Notes:
• A coder type can appear only once per Coder Group.
• For a list of supported coders and for configuring coders using the ini file,
refer to the ini file parameter table CodersGroup, described in SIP
Configuration Parameters.
• For information on coders, refer to the notes in ''Configuring Coders'' on
page 118.
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