Avaya 5.0/Business User Manual Page 114

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114 BCM 200/400 configuration
Table 8
H.323 Media Parameters fields
Field Value Description
Preferred Codecs
G.711 -uLaw
G.711 -aLaw
G.729
G.723
Add codecs to the Selected list and order them in
the order in which you want the system to attempt
to use them. The system attempts to use the
codecs in top-to-bottom sequence.
Performance note: Codecs on all networked
BCMs must be consistent to ensure the proper
functionality of interacting features such as
Transfer and Conference.
Systems running BCM Release 3.5 or later
allow codec negotiation and renegotiation to
accommodate inconsistencies in codec settings
over VoIP trunks.
Enable Voice Activity
Detection
<check box> Voice Activity Detection (VAD), also known
as silence suppression, identifies periods of
silence in a conversation and stops sending
IP speech packets during those periods. In
a typical telephone conversation, most of the
conversation is half-duplex, meaning that one
person is speaking while the other is listening. If
VAD is enabled, no voice packets are sent from
the listener end. This greatly reduces bandwidth
requirements. G.723.1 and G.729 support VAD.
G.711 does not support VAD.
Performance note: VAD on all networked BCMs
and IPT systems must be consistent to ensure
functionality of features such as Transfer and
Conference. The Payload size on the IPT must
be set to 30ms.
Jitter Buffer
Auto
None
Small
Medium
Large
Select the size of jitter buffer for your system.
G.729 payload size
(ms)
10,20,30,40,50,60
G.723 payload size
(ms)
30
G.711 payload size
(ms)
10,20,30,40,50,60
Set the maximum required payload size, per
codec, for the VoIP calls sent over H.323 trunks.
Note: Payload size can also be set for Nortel IP
telephones. See BCM50 Networking Configuration
Guide (NN40020-603).
Enterprise: Common
Solution Integration Guide for Communication Server 1000 Release 5.0/Business Communications Manager
NN43001-326 01.06 Standard
Release 5.0 12 March 2008
Copyright © 2008, Nortel Networks
.
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