Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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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 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.
The following table lists the audio codecs supported by each phone model:
Phone Model
Supported Audio Codecs
Default Audio Codecs
SIP-T48G/T46G/T42
G/T41P/T29G/CP86
0
G722, PCMA, PCMU, G729, G726-16,
G726-24, G726-32, G726-40, iLBC,
G723_53, G723_63
G722, PCMA, PCMU,
G729
SIP-T40P/T27P/T23P/
T23G/T21(P)
E2/T19(P) E2
G722, PCMA, PCMU, G729, G726-16,
G726-24, G726-32, G726-40, iLBC
G722, PCMA, PCMU,
G729
SIP VP-T49G
G.722.1c(48kb/s), G.722.1c(32kb/s),
G.722.1c(24kb/s), G.722.1(24kb/s),
G722, PCMU, PCMA, G729, G726-16,
G726-24, G726-32, G726-40, iLBC,
G723, 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 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
Summary of Contents for CD860
Page 1: ......
Page 45: ...Getting Started 23 For SIP T42G T41P T40P Desk Mount Method Wall Mount Method Optional ...
Page 47: ...Getting Started 25 For SIP T23P T23G Desk Mount Method Wall Mount Method Optional ...
Page 122: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones 100 ...
Page 840: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series CP860 IP Phones 818 ...
Page 995: ...Appendix 973 ...