Codec Options:

  • G.711: Most common codec (ulaw/alaw), 64 kbit/s bitrate, free
  • G.729: Second most common codec, 8kbit/s bitrate, $ licensed
  • GSM: Common low bandwidth codec, 13 kbit/s bitrate, free
  • Many others with lower bitrates to higher bitrates for better quality
  • .
      • .711
      • LPC10
      • GSM
      • iLBC
      • G.726
      • G.722
      • ADPCM

Codecs reside in /usr/lib/asterisk/modules

You need to download the appropriate codec for your CPU

cat /proc/cpuinfo

and look your cpu up to get an idea for codec

EXAMPLE:

Download G.729 codec

Browse http://asterisk.hosting.lv

copy link for your asterisk version

Asterisk11

Go down to

NOTES:

module load and module unload is used in asterisk to load or unload codecs

If you want to use a specific codec for extensions or SIP Carrier

vi /etc/asterisk/sip.conf

edit allow=ulaw to allow=g729

allow=ulaw

add the allow=ulaw as a failback incase carrier doesn’t support G729

Included with Asterisk

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