Polycom SIP 2.2.0 manual Setting Up Audio Features, Low-Delay Audio Packet Transmission

Administrator’s Guide SoundPoint IP / SoundStation IP

lSet the roaming_privacy.reg element to the number corresponding to the LCS registration.

For example, roaming_privacy.reg = 2

Refer to Roaming Privacy <roaming_privacy/> on page A-99.

mSave the modified phone1.cfg configuration file.

Setting Up Audio Features

Proprietary state-of-the-art digital signal processing (DSP) technology is used to provide an excellent audio experience.

This section provides information for making configuration changes for the following audio-related features:

•Low-Delay Audio Packet Transmission

•Jitter Buffer and Packet Error Concealment

•Voice Activity Detection

•DTMF Tone Generation

•DTMF Event RTP Payload

•Acoustic Echo Cancellation

•Audio Codecs

•Background Noise Suppression

•Comfort Noise Fill

•Automatic Gain Control

•IP Type-of-Service

•IEEE 802.1p/Q

Low-Delay Audio Packet Transmission

The phone is designed to minimize latency for audio packet transmission.

There are no related configuration changes.

Jitter Buffer and Packet Error Concealment

The phone employs a high-performance jitter buffer and packet error concealment system designed to mitigate packet inter-arrival jitter and out-of-order or lost (lost or excessively delayed by the network) packets. The

4 - 42