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Configuring Audio Features

651

Parameter

Permitted Values

Default

Note: 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

voice.headset_send

Integer from -50 to 50

Description:

Configures the sending volume of the headset.

Note: 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:

Phone Model

Supported Audio Codecs

Default Audio Codecs

SIP-T48G/T46G/T42

G/T41P/T29G

G722, PCMA, PCMU, G729,

G726-16, G726-24, G726-32,

G726-40, iLBC, G723_53, G723_63

G722, PCMA, PCMU,

G729