Mod codec2
From FreeSWITCH Wiki
introduction
codec2 is a narrow band codec created by the developer of the speex codec
installation
codec2 is included in the freeswitch source tree, just add it in module.conf codecs/mod_codec2 save, and do: ./configure make make install
loading
add mod_codec2 to modules.xml
<load module="mod_codec2"/>

