V6100 and V7122 User Guide
103
2
From the Coder Group ID drop-down list, select the coder group you want to edit (up to
four coder groups can be configured).
3
From the Coder Name drop-down list, select the coder you want to use. For the full list of
available coders and their corresponding attributes, see the
ini
file parameter
‘CoderName_ID’ (described in
Table 48
).
Each coder can appear only once.
4
From the Packetization Time drop-down list, select the packetization time (in msec) for
the coder you selected. The packetization time determines how many coder payloads
are combined into a single RTP packet.
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.
5
From the Rate drop-down list, select the bit rate (in kbps) for the coder you selected.
6
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.
7
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.
8
Repeat Steps 3 to 7 for the second to fifth coders (optional).
9
Repeat Steps 2 to 8 for the second to fourth coder groups (optional).
10
Click the
Submit
button to save your changes.
11
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).
Summary of Contents for TP-1610
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