User's Manual

Table 38: Static payload types and other parameters for the supported codecs for the IP Deskphone
Codec Payload
type
SDP
encoding
name
Clock rate
(HZ)
Bit rate
(kbps)
ptime
(milisec)
Channels
G.711 a-law 8 PCMA 8000 20 1
G.711 u-law 0 PCMU 8000 20 1
G.711 a-law 8 PCMA 8000 30 1
G.711 u-law 0 PCMU 8000 30 1
G.729A +
40ms ptime
18 G729 8000 20 1
G.729B 18 8000 8 20 1
G.722 9 G722 8000 48 20 1
G.723.1 4 G723 8000 5.3
6.3
30 1
G.723.1A 4 8000 5.3
6.3
30 1
The annexes selection for G.729 and G.723.1 are not available to the user and the administrator is
responsible for enabling or disabling annexes using the Device Configuration parameters.
Codec preference through the Device Configuration file
Use the Device Configuration file to specify a list of codecs, and the preferred order in which
they are used for incoming and outgoing calls. 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 39: Sample Device Configuration file entries
AUDIO_CODEC1 PCMA standard a-law
AUDIO_CODEC2 PCMU standard u-law
AUDIO_CODEC3 G729 729 codec
AUDIO_CODEC4 G722 wideband codec
AUDIO_CODEC7 G723 high-compression codec
The IP Deskphone displays the codecs listed in the exact order that they are listed in the Device
Configuration file.
Audio codecs
246 SIP Software for Avaya 1100 Series IP Deskphones-Administration November 2012
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