3Com V6100, User Manual Manual, Page: 88 / 496

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V6100 and V7122 User Guide
If not specified, the ptime gets a default value.
The ptime specifies the packetization time the gateway expects to receive.
The gateway always uses the ptime requested by the remote side for sending
RTP packets.
4 From the Rate drop-down list, select the bit rate (in kbps) for the coder you selected.
5 In the Payload Type field, if the payload type for the coder you selected 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.
If not specified, a default is used.
6 From the Silence Suppression drop-down list, enable or disable the silence suppression
option for the coder you selected.
For G.729 it is also possible to select silence suppression without adaptations.
7 Repeat Steps 2 to 6 for the second to fifth coders (optional).
8
Click the Submit button to save your changes.
9
To save the changes so they are available after a power fail, see Save Configuration .
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. An exception to this logic is when the remote gateway is a Cisco
device (IsCiscoSCEMode).
Advanced Parameters
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Use this submenu to configure the following gateway’s advanced control protocol
parameters:
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CDR and Debug
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Miscellaneous Parameters
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Supplementary Services