Yealink SIP-T19 E2 T4 Series, Administrator'S Manual

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Configuring Audio Features
745
Parameters Permitted Values Default
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 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
G726-16 G.726 RFC 3551 16 Kbps 8 Ksps 20ms
G726-24 G.726 RFC 3551 24 Kbps 8 Ksps
20ms
G726-32 G.726 RFC 3551 32 Kbps 8 Ksps
20ms
G726-40 G.726 RFC 3551 40 Kbps 8 Ksps
20ms
G723_53/
G723_63
G.723.1 RFC 3551
5.3 Kbps
6.3 Kbps
8 Ksps 30ms
iLBC_15_2kbps iLBC RFC 3952 15.2 Kbps 8 Ksps 20ms
iLBC_13_33kbps iLBC RFC 3952
13.33
Kbps
8 Ksps 30ms