Version 6.2 139 February 2011
SIP User's Manual 3. Web-Based Management
3.3.2.10.1 Configuring Coders
The 'Coders' page allows you to configure up to 10 coders for the device. The first coder in
the list has the highest priority and is used by the device whenever possible. If the far-end
device cannot use the first coder, the device attempts to use the next coder in the list, and
so on.
Notes:
• For a list of supported coders and for configuring coders using the ini file,
refer to the ini file parameter table CodersGroup, described in SIP
Configuration Parameters.
• A coder (i.e., 'Coder Name') can appear only once in the table.
• If packetization time and/or rate are not specified, the default value is
applied.
• Only the packetization time of the first coder in the coder list is declared
in INVITE/200 OK SDP, even if multiple coders are defined.
• The device always uses the packetization time requested by the remote
side for sending RTP packets.
• For G.729, it's also possible to select silence suppression without
adaptations.
• If the coder G.729 is selected with silence suppression is disabled, the
device includes 'annexb=no' in the SDP of the relevant SIP messages. If
silence suppression is enabled or 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).
• For defining groups of coders (which can be assigned to Tel and IP
Profiles), see ''Configuring Coder Groups'' on page 140.
• For an explanation on V.152 support (and implementation of T.38 and
VBD coders), see ''Supporting V.152 Implementation'' on page 452.
¾ To configure the device's coders:
1. Open the 'Coders' page (Configuration tab > VoIP menu > Coders And Profiles
submenu > Coders).
Figure 3-70: Coders Page
2. From the 'Coder Name' drop-down list, select the required coder.
To Next Page
Loading...
