VQMON Codec configuration
You can enable the VQMON feature through the Device Configuration file to send an SIP Publish
message with the VQMON report as text content, and use this report for QoS monitoring.
Network layer for the SDP negotiations
The following table contains static payload types and other parameters for the supported codecs,
including the default ptime value for each codec. The phone may use a different value, ranging from
the default to 50 msec, if the caller (a third party caller) requests it by adding the corresponding
ptime attribute to the SDP. The 1200 SIP IP Deskphone does not include ptime in its SDP message.
Note that 10 msec ptime is not supported.
Table 71: 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)
Default
ptime
(msec)
Channels
G.711 a-law 8 PCMA 8000 20 1
G.711 u-law 0 PCMU 8000 20 1
G.729A +
40ms ptime
18 G729 8000 20 1
G.729B 18 8000 8 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 Device Configuration
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 also use the Device Configuration file 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.
VQMON Codec configuration
March 2015 SIP Software for Avaya 1200 Series IP Deskphones-Administration 239
Comments? infodev@avaya.com
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