AudioCodes Mediant 2000, User Manual

Page: 191 / 418

Version 5.6 191 November 2008
SIP User's Manual 3. Web-Based Management
Notes:
•
Each coder type can appear only once per Coder Group.
•
The device always uses the packetization time requested by the remote
side for sending RTP packets. If not specified, the packetization time
(ptime) is assigned the default value.
•
Only the packetization time 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, you can also select silence suppression without adaptations.
•
If silence suppression is enabled for G.729, the device 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 is when the remote device is a Cisco gateway
(IsCiscoSCEMode).
•
You can also configure the coder groups using the
ini
file table parameter
CoderName (refer to ''SIP Configuration Parameters'' on page 284 ).
¾
To configure coder groups, take these 11 steps:
1.
Open the 'Coder Group Settings' page (
Configuration
tab >
Protocol Configuration
menu >
Profile Definitions
submenu >
Coder Group Settings
page item).
Figure 3-79: Coder Group Settings Page
2.
From the 'Coder Group ID' drop-down list, select a coder group ID.
3.
From the 'Coder Name' drop-down list, select the first coder for the coder group.
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.