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V7122 GatewayUser 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
Saving 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.
Advanced Parameters
Use this submenu to configure the following gateway’s advanced control protocol
parameters:
CDR
and
Debug
Miscellaneous
Parameters
Supplementary
Services
Number Manipulation Tables
The VoIP gateway provides four Number Manipulation tables for incoming and outgoing
calls. These tables are used to modify the destination and source telephone numbers so that
the calls can be routed correctly.
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