Version 6.6 609 October 2014
Installation & Operation Manual 40. General SIP Configuration
40.5 Configuring Coders Table
When configuring the Coder's table, note the following:
Each coder may be defined in the Coders table only once.
The gateway 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 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 (refer to ‘Is Cisco SCE Mode’ parameter).
To configure Coders Table:
1. In the Navigation pane, select SIP
SIP General Coders Group; the SIP
Coders Group List is displayed.
2. Use the
or buttons to add or remove entries.
3. Select a specific row, and then in the Navigation pane, select Coders; the SIP
Coder List is displayed.
4. Use the
or buttons to add or remove entries.
5. Select a specific row, and then in the Configuration pane, click SIP Coders
Settings; the SIP Coders Settings screen is displayed.
6. Configure the Coder parameters according to the table 'Coder Parameters'
below.
7. Click the Maintenance icon
and select Unlock to activate the configuration.
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