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Display characteristics 201

• 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.

Dual-tone Multifrequency

GIPS implements Dual-tone Multifrequency (DTMF) tones playing and

sends in accordance to RFC 2833. DTMF supports event numbers from

1 to 16.

Telchemy VQMon

GIPS includes Telchemy VQMon library. The Telchemy VQMon library

collects and provides Voice Quality statistics information.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010