Asterisk VQM supported codecs

February 22, 2011 by admin · Leave a Comment
Filed under: Voice and Sound Quality Testing Software 

Hi,

Here is the list of codecs supported by Asterisk VQM:

G.711 ulaw (as used in US)
G.711 alaw (as used in Europe)
G.722 – 16 kHz wideband codec
G.723.1
G.726 – 32kbps only (16/24/32/40kbps supported in format_g726 for files
G.729 – may require a license
GSM
iLBC
LPC10
Speex

Basically, all codecs supported by Asterisk PBX are supported by Asterisk VQM. When narrowband codec used for transmission quality assessment is performed by AQuA Voice, and in case of wideband codec MOS score is obtained by AQuA Wideband.

  • G.711 ulaw (as used in US)
  • G.711 alaw (as used in Europe)
  • G.722 – 16 kHz wideband codec; passthrough, playback and recording in Asterisk 1.4; full support incl. transcoding in Asterisk 1.6, a backport for 1.4 is available, or use this more up-to-date patch
  • G.723.1 – pass-thru for people who need a license , free for other people
  • G.726 – 32kbps only (16/24/32/40kbps supported in format_g726 for files); flawed until Asterisk 1.4 which corrected the implementation and introduced codec g726aal2 and setting g726nonstandard for backwards compatibility with Asterisk 1.2 installations
  • G.729 – may require a license unless using pass-thru, free version available for use in countries without patents or for educational use only
  • GSM
  • iLBC
  • LPC10 (not recommended!)
  • Speex
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