Nortel BCM200 Integration Manual page 20

20 BCM 200/400 Release 4.0 configuration
Table 4
H.323 Media Parameters fields
Field
Preferred Codecs
Enable Voice
Activity Detection
Solution Integration Guide for Multisite Business Communications Manager Systems
Copyright © 2007, Nortel Networks
.
Ensure that these settings are consistent with the other systems on
your network.
Refer to Table 4 "H.323 Media Parameters fields" (page 20)
Table 5 "SIP Media Parameters fields" (page 21)
of the parameters.
Value
G.711 -uLaw
G.711 -aLaw
G.729
G.723
<check box>
Enterprise: Common
NN49000-303 01.01 Standard
Release 4.0, 3.7 29 June 2007
—End—
Description
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.
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.
and
for a description