Matrix SPARSH VP710, User Manual, Page: 681 / 1046

Matrix SPARSH VP710 User Guide 673
Audio Codecs
CODEC is an abbreviation of COmpress-DECompress, capable of coding or decoding a digital data stream or
signal by implementing an algorithm. The objective of the algorithm is to represent the high-fidelity audio signal with
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 IP phone uses to establish a call should be supported by the SIP server.When placing a
call, the IP phone offers 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 audio codecs supported by the IP phone are summarized in the following table:
The Opus codec supports various audio bandwidths, defined as follows:
The following table summarizes the supported audio codecs on IP phone:
Phone Model Supported Audio Codecs Default Audio Codecs
SPARSH VP710
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
Abbreviation Audio Bandwidth Sample Rate (Effective)
NB (narrowband)
4kHz 8 kHz
MB (medium-band)
6kHz 12 kHz
WB (wideband)
8kHz 16 kHz
SWB (super-wideband)
12kHz 24 kHz
FB (fullband)
20kHz 48 kHz
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