Matrix Sparsh VP110 User Manual

286 Matrix SPARSH VP110 User Guide
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 object 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 default codecs used on IP phones are summarized in the following table:
In addition to the codecs introduced above, IP phones also support codecs: G723_53, G723_63, G726-32. Codecs
and priorities of these codecs are configurable. The attribute “rtpmap” is used to define a mapping from RTP
payload codes to a codec, clock rate and other encoding parameters.
The corresponding attributes of the codec are listed as follows:
Codec Algorithm BitRate SampleRate PacketizationTime
PCMA G.711a‐law 64Kbps 8Ksps 20ms
PCMU
G.711‐law
64Kbps 8Ksps
20ms
G729 G.729 8Kbps 8Ksps
20ms
G722 G.722 64Kbps 16Ksps
20ms
Codec ConfigurationMethods Priority RTPmap
PCMU
ConfigurationFiles
WebUserInt erface
1
0
PCMA
ConfigurationFiles
WebUserInt erface
28
G729
ConfigurationFiles
WebUserInt erface
318
G722
ConfigurationFiles
WebUserInt erface
49
G723_53
ConfigurationFiles
WebUserInt erface
04
G723_63
ConfigurationFiles
WebUserInt erface
04

Matrix Sparsh VP110 Specifications

General

Brand	Matrix
Model	Sparsh VP110
Category	IP Phone
Language	English