
to enable or disable AnnexB support by G.729 and AnnexA support by G.723.1. You can add
a text descriptor to the technical name of the audio codec; these descriptors appear on the
user interface of the IP
Deskphone.
You can specify, by name, the exact codecs to offer in the Device Configuration file. This grants
the administrator full control over the audio settings used for inbound and outbound calls. The
following table is a sample of Device Configuration file entries for audio codec configuration.
Table 65: Sample Device Configuration entries
AUDIO_CODEC# CodecID text_description
AUDIO_CODEC1 PCMA standard a-law
AUDIO_CODEC2 PCMU standard u-law
AUDIO_CODEC3 G729 729 codec
AUDIO_CODEC7 G723 high-compression codec
The following table lists the codec identifiers for the Device Configuration file.
Table 66: Codec identifiers for the Device Configuration file
PCMA
PCMU
G729
G723
The IP Deskphone displays the codecs listed in the exact order that they are listed in the Device
Configuration file.
The list of codecs specified in the Device Configuration file determines the list of codecs that
are available for selection on the IP
Deskphone.
Two fields in the device configuration file, G729_ENABLE_ANNEXB and
G723_ENABLE_ANNEXA are used to enable or disable AnnexB and AnnexA support by
G.729 and G.723 codecx, respectively. These flags can have the following values: YES, NO
(No is the default value).
Important:
If codecs are not specified, the default list used by the current version of the IP
Deskphone
is PCMU, PCMA, G.729.
To stop the IP Deskphone from using a specific codec, you must change the its entry in the
Device Configuration file to a different codec, and then clear the value, which disables the
codec entry. If you remove all codecs from the allowed list, the IP Deskphone resets to the
default list of codecs.
Important:
T
o reset the phone to the default list of codecs, it is necessary to remove the values against
each AUDIO_CODECx item in the Device Configuration file.
Codec preference through Device Configuration
SIP Software for Avaya 1200 Series IP Deskphones-Administration November 2012 189
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