Difference between revisions of "Codecs"

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* [[I want to use codec G.729r8 | G729r8]]
* [[I want to use codec G.729r8 | G729r8]]
* Which codec to choose: http://wiki.kolmisoft.com/index.php/Which_codecs_should_I_choose_for_devices
* About HD Codecs: http://blog.radvision.com/voipsurvivor/2011/07/05/hd-voice-revisited/
* About HD Codecs: http://blog.radvision.com/voipsurvivor/2011/07/05/hd-voice-revisited/

Revision as of 10:38, 16 October 2012

Description

Codecs are used to convert an analog voice signal to digitally encoded version. Codecs vary in the sound quality, the bandwidth required, the computational requirements, etc

List of codecs supported by MOR can be found here.

Per Call Bandwidth requirements for various codecs

Codec & Bit Rate (Kbps) Codec Sample Size (Bytes) Codec Sample Interval (ms) Voice Payload Size (Bytes) Voice Payload Size (ms) Bandwidth Ethernet (Kbps)
G.711 (64 Kbps) 80 Bytes 10ms 160 bytes 20ms 87.2Kbps
G.729 (8 Kbps) 10 Bytes 10ms 20 bytes 20ms 31.2Kbps
G.723.1 (6.3 Kbps) 24 Bytes 30ms 24 bytes 30ms 21.9Kbps
G.723.1 (5.3 Kbps) 20 Bytes 30ms 20 bytes 30ms 20.8Kbps
G.726 (32 Kbps) 20 Bytes 5ms 80 bytes 20ms 55.2Kbps
G.726 (24 Kbps) 15 Bytes 5ms 60 bytes 20ms 47.2Kbps
G.728 (16 Kbps) 10 Bytes 5ms 60 bytes 30ms 31.5Kbps
G722_64k(64 Kbps) 80 Bytes 10ms 160 bytes 20ms 87.2Kbps
ilbc_mode_20(15.2Kbps) 38 Bytes 20ms 38 bytes 20ms 38.4Kbps
ilbc_mode_30(13.33Kbps) 50 Bytes 30ms 50 bytes 30ms 28.8Kbps
speex(24.6 Kbps) 66 Bytes 20ms 56 bytes 25ms 42.4 Kbps
speex(18.2 Kbps) 46 Bytes 20ms 56 bytes 20ms 42.4 Kbps



Transcoding

Transcoding is conversion from one codec to another. It is performed by Asterisk when LegA and LegB (user's and provider's) codecs do not match. Transcoding uses a lot of system resources, so it should be avoided to get better server performance.

For more information please visit



See also

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