Audio Codecs; Supported Audio Codecs - Yealink SIP-T3 Administrator's Manual

Administrator's Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
Supported
T57W, T54W, T53W, T53, T53C, T33P, T33G, T31P, T31G, T31, T30P, T30, CP920, CP925, CP935W
Devices
Parameter voice.tone.stutter_dial_tone.apply_to_vm.enable <y0000000000xx>.cfg
It enables or disables the phone to play a specified dial tone when the phone has a new voice mes-
sage.
Description
The dial tone is configured by "voice.tone.stutterdial".
Note: It works only if "voice.tone.country" is set to Custom.
0-Disabled
Permitted
Values
1-Enabled
Default 0
Supported
T57W, T54W, T53W, T53, T53C, T33P, T33G, T31P, T31G, T31, T30P, T30, CP920, CP925, CP935W
Devices

Audio Codecs

CODEC is an abbreviation of COmpress-DECompress, capable of coding or decoding a digital data stream or sig-
nal by implementing an algorithm. The object of the algorithm is to represent the high-fidelity audio signal with a
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 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 the phones:
Codec
G.722.1c
G.722.1c
G.722.1c
G.722.1
G722
PCMA(G.711A)
PCMU(G.711μ)
G729(G729A)
191
Algorithm Reference
RFC 5577
G.722.1c RFC 5577
RFC 5577
G.722.1 RFC 5577
G.722 RFC 3551
G.711 a-law RFC 3551
G.711 u-law RFC 3551
G.729 RFC 3551
Bit Rate Sample Rate
48 Kbps 32 Ksps
32 Kbps 32 Ksps
24 Kbps 32 Ksps
24 Kbps 16 Ksps
64 Kbps 16 Ksps
64 Kbps 8 Ksps
64 Kbps 8 Ksps
8 Kbps 8 Ksps
Packetization Time
20ms
20ms
20ms
20ms
20ms
20ms
20ms
20ms