Configuring Audio Features
685
Note: It is not applicable to CP860 IP phones. We recommend that you modify this
parameter cautiously. An unreasonable value may render the voice quality bad. If
you change this parameter, the IP phone will reboot to make the change take
effect.
Web User Interface:
None
Phone User Interface:
None
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 audio codec that the phone uses to establish a call should be supported by the SIP
server. When placing a call, the IP phone will offer the enabled audio codec list to the
server and then use the audio codec negotiated with the called party according to the
priority.
The following table lists the audio codecs supported by each phone model:
SIP-T48G/T46G/T42
G/T41P/T29G/CP860
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, iLBC, G723_53, G723_63
SIP-T40P/T27P/T23P/T
23G/T21(P)
E2/T19(P) E2
G722, PCMA, PCMU, G729,
G726-16, G726-24, G726-32,
G726-40, iLBC
The following table summarizes the supported audio codecs on IP phones:
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