Polycom Version 1.4.x 17 manual Audio Processing Features, Last Call Return

Administrator Guide - SoundPoint® IP / SoundStation® IP Features

3.2.9 Last Call Return

The phone allows server-based last call return. This feature depends on support from a SIP server.

	Configuration file:	Turn this feature on or off.
	ipmid.cfg	• For more information, see 4.6.1.21 Feature <feature/>
Central
		on page 109.
(boot
server)		Specify the string sent to the server for last-call-return.
		• For more information, see 4.6.1.10 Call Handling
		Configuration <call/> on page 92.
	Web Server	None.
Local	(if enabled)
	Local Phone User	None.
	Interface

3.3 Audio Processing Features

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

3.3.1 Low-Delay Audio Packet Transmission

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

3.3.2 Jitter Buffer and Packet Error Concealment

The phone employs a high-performance jitter buffer and packet error concealment sys- tem designed to mitigate packet inter-arrival jitter and out-of-order or lost (lost or excessively delayed by the network) packets. The jitter buffer is adaptive and config- urable for different network environments. When packets are lost, a concealment algorithm minimizes the resulting negative audio consequences.

Copyright © 2004 Polycom, Inc. 41