Configuring Allowed Audio Coder Groups - AudioCodes Mediant 800B User Manual

User's Manual
29.3

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 323). 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 534.
You can also use Allowed Audio Coders Groups to configure Extension coders. Extension
coders are coders (listed in the Allowed Audio Coders Group) which the device adds to the
SDP offer. For more information on Extension coders, see Coder Transcoding on page
534.
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. If Extension coders are also used, these coders can
be added after the Allowed coders or arranged with the Allowed coders according to their
appearance in the Allowed Coders Group. For more information, see ''Prioritizing Coder
List in SDP Offer'' on page 536.
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.
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To configure an Allowed Coders Group:
1. Open the Allowed Audio Coders Group page (Configuration tab > VoIP menu > SBC
> Allowed Audio Coders Group).
Version 6.8
Figure 29-4: Allowed Audio Coders Group Page
561 Mediant 800B Gateway and E-SBC
29. SBC Configuration