AudioCodes Mediant 4000 SBC User Manual page 424

CHAPTER 19 Coders and Profiles
■ The SDP offer in the incoming SIP message contains the G.729, G.711, and G.723 coders.
■ The allowed coders configured for the SIP entity include G.711 and G.729.
The device removes the G.723 coder from the SDP offer, re-orders the coder list so that G.711 is
listed first, and sends the SIP message containing only the G.711 and G.729 coders in the SDP.
To apply an Allowed Audio Coders Group for restricting coders to a SIP entity:
1. Configure an Allowed Audio Coders Group in the Allowed Audio Coders Groups table (see
description below).
2. In the IP Profile associated with the SIP entity (see
● Assign the Allowed Audio Coders Group (using the IpProfile_SBCAl-
lowedAudioCodersGroupName parameter).
● Enable the use of Allowed Audio Coders Groups (by configuring the IpProfile_
SBCAllowedCodersMode parameter to Restriction or Restriction and Preference).
The device also re-orders (prioritizes) the coder list in the SDP according to the order of appearance
of the coders listed in the Allowed Audio Coders Group. The first listed coder has the highest
priority and the last coder has the lowest priority. For more information, see
SDP Offer.
●
●
The following procedure describes how to configure Allowed Audio Coders Groups through the Web
interface. You can also configure it through ini file [AllowedAudioCodersGroups] and
AllowedAudioCoders) or CLI ( configure voip > coders- and- profiles allowed-
audio- coders- groups ; configure
audio-coders < group index/coder index>).
➢
To configure an Allowed Audio Coders Group:
1. Open the Allowed Audio Coders Groups table (Setup menu > Signaling & Media tab >
Coders & Profiles folder > Allowed Audio Coders Groups).
2. Click New; the following dialog box appears:
3. Configure a name for the Allowed Audio Coders Group according to the parameters described
in the table below.
4. Click Apply.
5. Select the new row that you configured, and then click the Allowed Audio Coders link
located below the table; the Allowed Audio Coders table opens.
6. Click New; the following dialog box appears:
The Allowed Audio Coders Group for coder restriction takes precedence over the
Coder Group for extension coders. In other words, if an extension coder is not listed
as an allowed coder, the device does not add the extension coder to the SDP offer.
To configure "extension" coders for adding to the SDP offer for audio transcoding,
use the Coder Groups table (see
Configuring IP
Configuring Coder Groups
voip > coders- and- profiles
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Mediant 4000 SBC | User's Manual
Profiles):
Prioritizing Coder List in
allowed-