Changing Audio Settings - Nortel i2002 User Manual

Standard—Nortel Networks Confidential

Changing audio settings

The i2002 Internet Telephone allows you to change speech codec settings, while
on a call, to achieve better audio quality. The term codec is an acronym that stands
for "Compression/Decompression". The codec setting controls how speech
compresses/decompresses into digital packets for transmission over the network.
Each codec selection provides a framesize in milliseconds for encoding the speech
packets. The larger the framesize, the less packets are required and so the greater
the efficiency of transmitting speech over the network. However, it also means that
the speech delay is increased on the call.
A general rule for selecting the codec and framesize is as follows:
High quality
PCMU 20 ms
PCMA 20 ms
G729A 20 ms
1 During an active call, press the Audio softkey.
The display shows two choices:
1. Change audio setting.
2. Monitor audio quality.
2
Select the Change audio setting option and press Ok.
3
Use the navigation buttons to highlight the desired quality setting and press
Select. The system applies the new audio settings.
Note: The changed setting only applies to the current active call. The
settings return to default for the next call.
Medium quality
PCMU 30 ms
PCMA 30 ms
Tip: Your system administrator sets the default codec and framesize for
all your calls.
Chapter 7 Troubleshooting
Low quality
G729A 30 ms
i2002 Internet Telephone User Guide
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