Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
165
Values
1-Enabled
Default
0
Supported
Devices
T57W, T54W, T53W, T53
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
Algorithm
Reference
Bit Rate
Sample Rate
Packetization Time
G.722.1c
G.722.1c
RFC 5577
48 Kbps
32 Ksps
20ms
G.722.1c
RFC 5577
32 Kbps
32 Ksps
20ms
G.722.1c
RFC 5577
24 Kbps
32 Ksps
20ms
G.722.1
G.722.1
RFC 5577
24 Kbps
16 Ksps
20ms
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