Coders And Profiles; Configuring Coder Groups - AudioCodes Mediant 4000 SBC User Manual

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CHAPTER 19 Coders and Profiles

Coders and Profiles

This section describes configuration of coders and SIP profiles.

The Coder Groups table lets you configure up to 21 Coder Groups. The Coder Group determines the

audio (voice) coders used for calls. Each Coder Group can include up to 10 coders, where the

packetization time (ptime), bit rate, payload type, and silence suppression can be configured per

coder. The first coder in the Coder Group has the highest priority and is used by the device

whenever possible. If the remote side cannot use the first coder, the device attempts to use the

next coder in the Coder Group, and so on.

The Coder Groups table provides a pre-defined Coder Group (index 0) that is configured with the

G.711 A-law coder. If no other Coder Groups are configured, the default Coder Group (which you

can modify) is used for all calls. Alternatively, if you want to use specific coders or coder settings

(e.g., packetization time) for different calls (entities), you need to configure a Coder Group for each

entity and then assign each Coder Group to an IP Profile (see

with the entity (IP Group). If an IP Group is not associated with a Coder Group, the default Coder

Group is used.

You can also use Coder Groups for audio coder transcoding of SBC calls. If two SIP entities need

to communicate, but one does not support a coder required by the other, the device can add the

required coder to the SDP offer. The added coder is referred to as an extension coder. For more

information on extension coders, see

To apply a Coder Group for transcoding to a SIP entity:

Configure a Coder Group in the Coder Groups table (see description below).

In the IP Profile associated with the SIP entity (see

Assign the Coder Group (using the IpProfile_SBCExtensionCodersGroupName

Enable the use of the Coder Group for transcoding (by configuring the IpProfile_

SBCAllowedCodersMode parameter to Restriction or Restriction and Preference).

Transcoding.

Configuring IP

Mediant 4000 SBC | User's Manual

Configuring IP

Profiles) associated