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

• • codec_g729-ast110-gcc4-glibc-x86_64-pentium4.so
  • copy that URL
  • In asterisk server
  • cd /usr/lib/asterisk/modules
  • wget the .so
  • chmod +x .so file
  • asterisk -rvvv
  • module load codec_g729
  • core show translation

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