User's Manual

Display characteristics 215
GIPS
GIPS provides the following abilities
•
voice encoding and decoding
•
sound devices handling
• network voice data flow processing
• voice quality improvement
•
Dual-tone Multifrequency
• Telchemy VQMon library
For more information about configurable settings in the Sound Settings
tab, see IP Softphone 2050 User Guide (NN43119-101).
Voice encoding and decoding
GIPS supports G.711 A-law, G.711 µ-law, and g.729 codecs.
Sound devices handling
You can change the volume level for input and output devices in the
Sound devices tab.
Network voice data flow processing
GIPS uses GQoS API to modify the DiffSERV code point and the 802.1p
marker bits (when supported) by setting a GQoS service level that the
Windows operating system maps to a Diffserv code point and to a 802.1p
setting. According to Microsoft Developer Network (MSDN), these settings
are set to the following recommended values for voice applications
•
ToS DSCP field is set to 0x28
•
802.1p priority field is set to 5
Voice quality
GIPS implements NetEQ, Echo Cancellation, and Noise Suppression
features. NetEQ feature is an integral part of all GIPS codecs. GIPS
NetEq software compensates for up to 30% lost packets in a LAN or WAN
environment.
The GIPS Echo Cancellation and Noise Suppression features improve the
quality of conversations by removing echo and background noise.
You can enable or disable Echo Cancellation and Noise Suppression
features in the Sound Settings tab.
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 02.07
5 February 2009
Copyright © 2003-2009 Nortel Networks
.