3Com VCX v7111 User Manual page 128

Coder Group Settings
Use the Coder Group Settings screen to define up to four different coder groups. These
coder groups are used in the Tel and IP Profile Settings screens to assign different coders to
Profiles.
For each group you can define the first to fifth preferred coders (and their attributes) for the
gateway. The first coder is the highest priority coder and is used by the gateway whenever
possible. If the far end gateway cannot use the coder assigned as the first coder, the
gateway attempts to use the next coder and so forth.
To configure the coder group settings:
Open the Coder Group Settings screen (Protocol Management menu > Profile
1
Definitions submenu > Coder Group Settings option); the Coder Group Settings screen is
displayed.
Coder Group Settings Screen
Figure 42
From the Coder Group ID drop-down list, select the coder group you want to edit (up to
2
four coder groups can be configured).
From the Coder Name drop-down list, select the coder you want to use. For the full list of
3
available coders and their corresponding attributes, see
From the Packetization Time drop-down list, select the packetization time (in msec) for
4
the coder you selected. The packetization time determines how many coder payloads
are combined into a single RTP packet.
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
6
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.
From the Silence Suppression drop-down list, enable or disable the silence suppression
7
option for the coder you selected.
Repeat Steps 3 to 7 for the second to fifth coders (optional).
8
Repeat Steps 2 to 8 for the second to fourth coder groups (optional).
9
128
Table 20.
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3Com VCX V7111 VoIP Gateway User Guide