User's Manual 35. Configuring Coder Groups
Version 6.8 553 Mediant 500L MSBR
35 Configuring Coder Groups
35.1 Configuring Allowed Audio Coder Groups
The Allowed Audio Coders Group table lets you configure up to five Allowed Audio Coders
Groups. An Allowed Audio Coders Group defines a list of audio media coders that can be
used for a specific SIP entity. Each Allowed Audio Coders Group can be configured with up
to 10 coders. The coders can include pre-defined audio coders (according to the installed
Software License Key) and user-defined (string) coders for non-standard or unknown
coders.
Allowed Audio Coders Groups are assigned to SIP entities, using IP Profiles (see
''Configuring IP Profiles'' on page 332). Coders that are not listed in the Allowed Audio
Coders Group are removed from the SDP offer ('a=rtpmap' field) that is sent to the SIP
entity. Only coders that are common between the coders in the SDP offer and the coders
listed in the Allowed Audio Coders Group are used. Thus, Allowed Audio Coders Groups
enable you to enforce the use of only specified coders. For more information, see
''Restricting Coders'' on page 523.
The order of appearance of the coders listed in the Allowed Audio Coders Group
determines the priority (preference) of the coders in the SDP offer. The device arranges the
SDP offer's coder list according to their order in the Allowed Audio Coders Group. The
priority is in descending order, whereby the first coder in the list is given the highest priority
and the last coder, the lowest priority. For more information, see ''Prioritizing Coder List in
SDP Offer'' on page 524.
The following procedure describes how to configure Allowed Audio Coder Groups in the
Web interface. You can also configure Allowed Audio Coder Groups using the table ini file
parameter, AllowedCodersGroup or CLI command, configure voip > sbc allowed-coders-
group group-0.
To configure an Allowed Coders Group:
1. Open the Allowed Audio Coders Group page (Configuration tab > VoIP menu > SBC
> Allowed Audio Coders Group).
Figure 35-1: Allowed Audio Coders Group Page
2. Configure an Allowed Audio Coders Group according to the parameters described in
the table below.
3. Click Submit, and then reset the device with a save ("burn") to flash memory.
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