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ALE M3-M5-M7-M8 DeskPhones Administrator Guide
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19 - Russia
20 - China(Mainland)
21 - China(Hongkong)
22 - China(Taiwan)
23 - Thailand
24 - Korea
25 - Japan
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7.7 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 a 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.
7.7.1 Supported Audio Codecs
The following table summarizes the supported audio codecs on IP phones:
Codec
Algorithm
Reference
Bit Rate
Sample Rate
Packetization Time
G722
G722
RFC 3551
64 Kbps
16 Ksps
20ms
PCMA
PCMA G.711
a-law
RFC 3551
64 Kbps
16 Ksps
20ms
PCMU
G.711 u-law
RFC 3551
64 Kbps
16 Ksps
20ms
G729
G729
RFC 3551
8 Kbps
16 Ksps
20ms
iLBC_15_2kbps
iLBC
RFC 3952
15.2 Kbps
8 Ksps
20ms
iLBC_13_33kbps iLBC
RFC 3952
13.33 Kbps
8 Ksps
30ms
opus
opus
RFC 6716
8-12 Kbps
28-40 Kbps
64-128 Kbps
8 Ksps
16 Ksps
48 Ksps
20ms
The Opus codec supports various audio bandwidths, defined as follows:
Abbreviation
Audio Bandwidth
Sample Rate (Effective)
NB (narrowband)
4 kHz
8 kHz
WB (wideband)
8 kHz
16 kHz
FB (fullband)
20 kHz
48 kHz
The following table lists the audio codecs supported by each phone model:
Phone Model
Supported Audio Codecs
Default Audio Codecs
Myriad Series
pcmu;pcma;g729AB;g722;iLBC;opus pcmu;pcma;g729AB;g722;iLBC
7.7.2 Audio Codecs Configuration
The following table lists the parameters you can use to configure the audio codecs.
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