SIP User's Manual 134 Document #: LTRT-68806
Mediant 2000 & TP-1610 & TP-260/UNI
2. From the 'Coder Group ID' drop-down list, select a coder group ID that you want to
add (up to four coder groups can be configured).
3. From the 'Coder Name' drop-down list, select the first coder for the coder group. For a
full list of available coders and their corresponding attributes, refer to 'Coders' on page
96.
4. From the 'Packetization Time' drop-down list, select the packetization time (in msec)
for the coder. The packetization time determines how many coder payloads are
combined into a single RTP packet.
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.
7. From the 'Silence Suppression' drop-down list, enable or disable the silence
suppression option for the coder you selected.
8. Repeat steps 3 through 7 for the second to fifth coders (optional).
9. Repeat steps 2 through 8 for the second to fourth coder groups (optional).
10. Click the Submit button to save your changes.
11. To save the changes to flash memory, refer to 'Saving Configuration' on page 256.
Notes:
• Each coder can appear only once.
• 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. If not specified, the packetization time
(ptime) gets a default value.
• 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.
• For G.729 it is also possible to select silence suppression without
adaptations.
• 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).
5.5.5.2 Tel Profile Settings
The Tel Profile Settings option is used to define up to nine different Tel Profiles. These
Profiles are used in the 'Trunk Group Table' screen where they can be assigned to the
gateway's channels, thereby applying different behaviors to different channels.
You can also configure Tel Profiles using the ini file parameter TelProfile (refer to 'SIP
Configuration Parameters' on page 295).
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