Local Conference Mixing; Voice Activity Detection (Vad) - Polycom SoundPoint IP 301 Administrator's Manual

Administrator Guide - SoundPoint
urable for different network environments. When packets are lost, a concealment
algorithm minimizes the resulting negative audio consequences.
Central
(boot
server)
Local

3.3.3 Local Conference Mixing

The phone's audio processing subsystem contains a flexible three-party conferencing
4
capability
external protocol signaling is involved.

3.3.4 Voice Activity Detection (VAD)

The purpose of VAD is to conserve network bandwidth by detecting periods of rela-
tive "silence" in the transmit data path and replacing that silence efficiently with spe-
cial packets that indicate silence is occurring. For those compression algorithms
without an inherent VAD function, such as G.711, the phone is compatible with the
comprehensive codec-independent comfort noise transmission algorithm specified in
RFC 3389. This algorithm is derived from G.711 Appendix II, which defines a com-
fort noise (CN) payload format (or bit-stream) for G.711 use in packet-based, multi-
media communication systems. The phone generates CN packets (also known as
4. On SoundStation IP
This restriction will be removed in future releases.
® ®
IP / SoundStation
Configuration file:
sip.cfg
Web Server
(if enabled)
Local Phone User
Interface
. This feature can be used to set up local three-party conferences where no
®
4000, conferences are not available if the G.729 codec is enabled on the phone.
Copyright © 2005 Polycom, Inc.
IP
Set the jitter buffer tuning parameters including minimum
and maximum size and shrink aggression.
• For more information, see 4.6.1.8.1.2 Codec Profiles
<profiles/> on page 95.
Set the jitter buffer tuning parameters including minimum
and maximum size and shrink aggression.
Navigate to: http://<phoneIPAddress>/coreConf.htm#au
Changes are saved to local flash and backed up to <Ethernet
address>-phone.cfg on the boot server. Changes will per-
manently override global settings unless deleted via the
Reset User Settings menu selection.
None.
Features
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