Audio Codecs - Alcatel-Lucent ALE M3 Administrator's Manual

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