Avaya 1230 - Chapter 24: Audio Codecs

Chapter 24: Audio codecs
Overview
The optional audio codecs feature allows you to select the audio compression or decompression
algorithm (codec) used on the Avaya IP Deskphone. You provision codecs using the Device
Configuration file, and then the user can select from the provisioned codecs using the Audio menu
on the Avaya 1200 Series IP Deskphone.
When the user selects an audio codec, that codec is used for both incoming and outgoing calls.
The following table lists the audio codecs supported by IP Deskphone.
Table 70: Audio codecs supported by IP Deskphone
Codecs Description
G.723.1 This codec is a compressed, nonwideband audio codec. It provides high-
quality audio with less network connection requirements. This codec is
ideal for bandwidth-conscious environments that do not support higher
quality encoding. Expanded support of the existing G.729a codec with
Annex allows for two byte Silence Insertion Descriptor (SID) frame for
CNG.
G.711 a-law PCMA
G.711 mu-law PCMA
G.729
In the case of an upgrade from a UNIStim IP Deskphone or an earlier version of the SIP firmware,
Avaya recommends that you specify the preferred codec in the Device Configuration file; otherwise
the default value is used.
The G.711 codec (PCMU and PCMA) is always used to place the codec list for emergency 911
calls. The G.711 codec is always used to receive incoming calls from the emergency operator. If the
administrator disables this codec, the SIP IP Deskphone can make outgoing non emergency calls.
You can configure a maximum of 15 codecs. You can enable or disable the use of specific codecs
for incoming and outgoing calls, though incoming and outgoing calls are not specifically
independent.
238 SIP Software for Avaya 1200 Series IP Deskphones-Administration March 2015
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