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Configuring Audio Features
685
Parameter
Permitted Values
Default
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:
Phone Model
Supported Audio Codecs
Default Audio Codecs
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
G722, PCMA, PCMU,
G729
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
G722, PCMA, PCMU,
G729
The following table summarizes the supported audio codecs on IP phones:
Codec
Algorithm
Reference
Bit Rate
Sample
Rate
Packetization
Time
G722
G.722
RFC 3551
64 Kbps
16 Ksps
20ms
PCMA
G.711 a-law
RFC 3551
64 Kbps
8 Ksps
20ms
PCMU
G.711 u-law
RFC 3551
64 Kbps
8 Ksps
20ms
G729
G.729
RFC 3551
8 Kbps
8 Ksps
20ms
Summary of Contents for Yealink SIP-T42G
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Page 12: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones xii ...
Page 20: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones xx ...
Page 41: ...Getting Started 21 For SIP T46G Desk Mount Method Wall Mount Method Optional ...
Page 43: ...Getting Started 23 For SIP T29G T27P Desk Mount Method Wall Mount Method Optional ...
Page 45: ...Getting Started 25 For SIP T21 P E2 Desk Mount Method Wall Mount Method Optional ...
Page 678: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones 658 ...