Configuring Audio Features
193
To configure dual headset via web user interface:
1.
Click on Features->General Information.
2.
Select the desired value from the pull-down list of Dual-Headset.
3.
Click Confirm to accept the change.
CODEC is an abbreviation of COmpress-DECompress, capable of coding or decoding a
digital data stream or signal by implementing an algorithm. The object of the algorithm
is to represent the high-fidelity audio signal with minimum number of bits while retaining
the quality. This can effectively reduce the frame size and the bandwidth required for
audio transmission.
The default codecs used on IP phones are summarized in the following table:
Codec
Algorithm
Bit Rate
Sample Rate Packetization Time
PCMA
G.711 a-law
64 Kbps
8 Ksps
20ms
PCMU
G.711 u-law
64 Kbps
8 Ksps
20ms
G729
G.729
8 Kbps
8 Ksps
20ms
G722
G.722
64 Kbps
16 Ksps
20ms
In addition to the codecs introduced above, IP phones also support codecs: G723_53,
G723_63, G726-16, G726-24, G726-32, G726-40, GSM and iLBC. Codecs and priorities of
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