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
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