Acoustic Echo Cancellation (Aec); Audio Codecs - Polycom Version 1.4.x 17 Administrator's Manual

Administrator Guide - SoundPoint

3.3.7 Acoustic Echo Cancellation (AEC)

The phone employs advanced acoustic echo cancellation for hands-free operation.
Both linear and non-linear techniques are employed to aggressively reduce echo yet
provide for natural full-duplex communication patterns.

3.3.8 Audio Codecs

The following table summarizes the phone's audio codec support:
Algorithm
G.711µ-law
G.711a-law
G.729AB
SID
RFC 2833
Central
(boot
server)
Local
44
® ®
IP / SoundStation IP
MIME Type Ref.
PMCU RFC
1890
PCMA RFC
1890
G729 RFC
1890
CN RFC
3389
phone-event RFC
2833
Configuration file: Specify codec priority, preferred payload sizes, and jitter
ipmid.cfg buffer tuning parameters.
For more information, see
•
•
Web Server Specify codec priority, preferred payload sizes, and jitter
(if enabled) buffer tuning parameters.
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.
Local Phone User None.
Interface
Copyright © 2004 Polycom, Inc.
Sample
Bit Rate Rate
64 Kbps 8 Ksps
64 Kbps 8 Ksps
8 Kbps 8 Ksps
N/A N/A
N/A N/A
4.6.1.6.1.1 Codec Preferences <preferences/> on
page 79, and
4.6.1.6.1.2 Codec Profiles <profiles/> on page 79.
Features
Effective
audio band-
Frame Size width
10ms - 80ms 3.5KHz
10ms - 80ms 3.5KHz
10ms - 80ms 3.5KHz
N/A N/A
N/A N/A