Avaya SIP Software 3.2 for 1200 Series Manual de usuario Pagina 191

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Chapter 22: 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 64: 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.
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