
Version 5.6 125 November 2008
SIP User's Manual 3. Web-Based Management
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 button to save your changes.
9. To save the changes to flash memory, refer to ''Saving Configuration'' on page 209.
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).
3.4.4.1.5 DTMF & Dialing Parameters
The 'DTMF & Dialing' page is used to configure parameters associated with dual-tone multi-
frequency (DTMF) and dialing.
¾ To configure the DTMF and dialing parameters, take these 4 steps:
1. Open the 'DTMF & Dialing' page (Configuration tab > Protocol Configuration menu
> Protocol Definition submenu > DTMF & Dialing page item).
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