Voice Codec List Command Set - ADTRAN AOS Version R10.1.0 Command Reference Manual

Command Reference Guide
V CODEC L
OICE
Voice coder-decoder (CODEC) lists are lists of CODECs arranged in preferred order with the first listed
CODEC being the most preferred for call negotiation.
The primary reason to create and assign voice CODEC lists is to save time. CODEC lists are created,
listing CODECs in the order of preference, and then lists are applied to interfaces using the codec-group
command (refer to the specific interface configuration command set for more information). Configuring a
CODEC list allows the list to be applied to multiple interfaces, such as Media Gateway Control Protocol
(MGCP) interfaces, voice trunks, voice accounts, and voice users without having to define the order of
CODECs individually. The order of preference is used primarily to conserve bandwidth on wide area
network (WAN)-based interfaces.
For example, when a user makes an outbound call from a foreign exchange station (FXS) port to a Session
Initiation Protocol (SIP) trunk, the trunk will look at its CODEC list and query the user making the call as
to which CODEC is to be used according to its CODEC list. It will query with the first CODEC (for
example, G.729). If this CODEC is listed in the CODEC list that is applied to the user (no matter the
CODEC preference on the user interface), then G.729 is agreed upon and the call will be converted and
sent out the trunk. This is the most bandwidth conservative CODEC in this case.
To activate the Voice CODEC List Configuration mode, enter the voice codec-list trunk command at the
Global Configuration mode prompt. For example:
>enable
#configure terminal
(config)#voice codec-list List1
(config-codec)#
The following commands are common to multiple command sets and are covered in a centralized section
of this guide. For more information, refer to the sections listed below:
cross-connect on page 67
description <text> on page 70
do on page 71
exit on page 73
interface on page 74
All other commands for this command set are described in this section in alphabetical order.
codec on page 3804
default on page 3806
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IST OMMAND
Copyright © 2012 ADTRAN, Inc.

Voice CODEC List Command Set

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