Audio Codecs; Supported Audio Codecs - Yealink SIP-T2 Series Administrator's Manual

Parameters
If it is left blank, the user can adjust the ringer volume on the phone.
Web User Interface:
None
Phone User Interface:
None

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.

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
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
Permitted Values
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
8 Ksps
Kbps
Configuring Audio Features
Default
Packetization
Time
20ms
20ms
20ms
20ms
20ms
20ms
20ms
20ms
30ms
20ms
30ms
745