| Configuring the Audio Settings | 133
Codecs
CODEC is an abbreviation of COmpress-DECompress, and is 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/video signal with a minimum number of bits while retaining quality. This can effectively reduce the
frame size and the bandwidth required for audio/video transmission. The administrator can configure the
codec and its priority for the devices.
• Audio Codec
• Video Codecs
Audio Codec
The audio codec that the system uses to establish a call should be supported by the server. When placing
a call, the system 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
• Configuring Audio Codecs
Supported Audio Codecs
The following table summarizes the supported audio codecs on the devices:
Audio Codec Algorithm Bit Rate Sample Rate Reference
Opus opus
8-12 Kbps
16-20 Kbps
28-40 Kbps
48-64 Kbps
64-128 Kbps
8 Ksps
12 Ksps
16 Ksps
24 Ksps
48 Ksps
RFC 6716
ARES ARES 8-64kpbs 48 Ksps No
G.722.1C 48 Kbps 32 Ksps RFC 5577
G.722.1C 32 Kbps 32 Ksps RFC 5577
G.722.1C 24 Kbps 32 Ksps RFC 5577
G.722.1
G.722.1
24 Kbps 16 or 32 Ksps RFC 5577
G722 G.722 64 Kbps 16 Ksps RFC 3551
PCMU G.711 u-law 64 Kbps 8 Ksps RFC 3551
PCMA G.711 a-law 64 Kbps 8 Ksps RFC 3551
The Opus codec supports the following audio bandwidths:
Abbreviation Audio Bandwidth Sample Rate (Effective)
NB (narrowband) 4 kHz 8 kHz
MB (medium-band) 6 kHz 12 kHz
WB (wideband) 8 kHz 16 kHz
SWB (super-wideband) 12 kHz 24 kHz
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