Background Noise Suppression; Comfort Noise Fill; Automatic Gain Control; Ip Type-Of-Service - Polycom SIP 2.2.0 Administrator's Manual

Administrator's Guide SoundPoint IP / SoundStation IP

Background Noise Suppression

Comfort Noise Fill

Automatic Gain Control

IP Type-of-Service

Central Configuration file:
sip.cfg
(boot server)
Local Web Server
(if enabled)
4 - 46
Background noise suppression (BNS) is designed primarily for hands-free
operation and reduces background noise to enhance communication in noisy
environments.
There are no related configuration changes.
Comfort noise fill is designed to help provide a consistent noise level to the
remote user of a hands-free call. Fluctuations in perceived background noise
levels are an undesirable side effect of the non-linear component of most AEC
systems. This feature uses noise synthesis techniques to smooth out the noise
level in the direction toward the remote user, providing a more natural call
experience.
There are no related configuration changes.
Automatic Gain Control (AGC) is applicable to hands-free operation and is
used to boost the transmit gain of the local talker in certain circumstances. This
increases the effective user-phone radius and helps with the intelligibility of
soft-talkers.
There are no related configuration changes.
The "type of service" field in an IP packet header consists of four
type-of-service (TOS) bits and a 3-bit precedence field. Each TOS bit can be set
to either 0 or 1. The precedence field can be set to a value from 0 through 7. The
type of service can be configured specifically for RTP packets and call control
packets, such as SIP signaling packets.
Configuration changes can performed centrally at the boot server or locally:
Specify protocol-specific IP TOS settings.
• For more information, refer to
Specify IP TOS settings.
Navigate to: http://<phoneIPAddress>/netConf.htm#qo
IP TOS <IP/> on page A-48.