To configure the device's coders:
1. Open the 'Coders' page (Configuration tab > Protocol Configuration menu >
Coders And Profile Definition submenu > Coders
Figure 3-63: Coders Page
page item).
2. From the 'Coder Name' drop-down list, select the required coder. For the full list of
available coders and their corresponding attributes, refer to the parameter CoderName
(refer to ''SIP Configuration Parameters'' 252 on page ).
3. From the 'Packetization Time' drop-down list, select the packetization time (in msec)
for the selected coder. The packetization time determines how many coder payloads
are combined into a single RTP packet.
4. From the 'Rate' drop-down list, select the bit rate (in kbps) for the selected coder.
5. In the 'Payload Type' field, if the payload type for the selected coder is dynamic, enter
a value from 0 to 120 (payload types of 'well-known' coders cannot be modified). The
payload type identifies the format of the RTP payload.
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 second to fifth optional coders.
8. Click the Submit
9. To save the changes to flash memory, refer to ''
button to save your changes.
Saving Configuration'' 167 on page .
Notes:
• Each coder (i.e., 'Coder Name') can appear only once.
• 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.
• For G.729, it's also possible to select silence suppression without
adaptations.
• If the coder G.729 is selected and silence suppression is disabled (for
this coder), the device includes the string '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).
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