User`s manual

Mediant 2000 & TP-1610 & TP-260
SIP User's Manual 78 Document #: LTRT-68805
5.5.6.1 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.
¾ To configure the coder group settings, take these 11 steps:
1. Open the ‘Coder Group Settings’ screen (Protocol Management menu > Profile
Definitions submenu > Coder Group Settings option); the ‘Coder Group Settings’
screen is displayed.
Figure 5-14: Coder Group Settings Screen
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, refer to the ini file parameter
‘CoderName_ID’ (described in Table 6-7).
Note: 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.
Note 1: If not specified, the ptime gets a default value.
Note 2: 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.
Note: 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.
Note: 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).