Yealink CP969, Administrator'S Manual

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Administrator’s Guide for SIP-T5 Series Smart Media Phones
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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 lists the audio codecs supported by SIP-T58V/T58A/T56A/CP960 IP phones:
Phone Model Supported Audio Codecs Default Audio Codecs
SIP-T58V/T58A/T56A/
CP960
G.722.1c(48kb/s), G.722.1c(32kb/s),
G.722.1c(24kb/s), G.722.1(24kb/s),
G722, PCMU, PCMA, G729, G726-40,
G726-32, G726-24, G726-16, iLBC,
G723_53, G723_63, Opus G.722.1c(48kb/s),
G.722.1c(32kb/s),
G.722.1c(24kb/s),
G.722.1(24kb/s), G722,
PCMU, PCMA, G729
The Opus codec supports various audio bandwidths, defined as follows:
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
FB (fullband) 20 kHz 48 kHz
The following table summarizes the supported audio codecs on IP phones:
Codec Algorithm Reference Bit Rate
Sample
Rate
Packetization
Time
G.722.1c
G.722.1
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