Nortel IP Phone 2007 User Manual page 122

Standard
122
The codec setting controls how speech compresses or 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 shown in
and framesize" on page
Table 5 Codec and framesize
High quality
PCMU 20 ms
PCMA 20 ms
G729A 20 ms
Changing audio settings during a call
1
During an active call, press the Audio soft key.
2
Select the Change audio setting option and press Ok.
3
Use the navigation buttons to select the desired quality setting and press
Select. The system applies the new audio settings.
NN42020-104 MCS 5100 Release 4.0
Note: The changed setting applies only to the current active call. The
settings return to default for the next call.
122..
Medium quality
PCMU 30 ms
PCMA 30 ms
Tip: Your system administrator sets the default codec and framesize for
all your calls.
Standard 01.04
Table 5 "Codec
Low quality
G729A 30 ms
March 2007