Audio Codecs; Supported Audio Codecs - Yealink T54S Administrator's Manual

Audio Codecs

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.
Topics

Supported Audio Codecs

Audio Codecs Configuration
Supported Audio Codecs
The following table summarizes the supported audio codecs on IP phones:
Codec
G722
PCMA
PCMU
G729
G726-16
G726-24
G726-32
G726-40
G723_53/
G723_63
iLBC_15_2kbps
iLBC_13_33kbps
opus
Algorithm Reference
G.722 RFC 3551
G.711 RFC 3551
a-law
G.711 RFC 3551
u-law
G.729 RFC 3551
G.726 RFC 3551
G.726 RFC 3551
G.726 RFC 3551
G.726 RFC 3551
G.723.1 RFC 3551
iLBC RFC 3952
iLBC RFC 3952
opus RFC 6716
Sample
Bit Rate
Rate
64 Kbps 16 Ksps
64 Kbps 8 Ksps
64 Kbps 8 Ksps
8 Kbps 8 Ksps
16 Kbps 8 Ksps
24 Kbps 8 Ksps
32 Kbps 8 Ksps
40 Kbps 8 Ksps
5.3 Kbps
8 Ksps
6.3 Kbps
15.2 Kbps 8 Ksps
13.33 Kbps 8 Ksps
8-12 Kbps 8 Ksps
16-20 Kbps 12 Ksps
28-40 Kbps 16 Ksps
48-64 Kbps 24 Ksps
Audio Features
Packetization
Time
20ms
20ms
20ms
20ms
20ms
20ms
20ms
20ms
30ms
20ms
30ms
20ms
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