Fax For Asterisk provides two components: res_fax and res_fax_digium. Res_fax is an Asterisk resource module that adds fax termination and origination functionality in Asterisk. It provides Asterisk dialplan functions and dialplan applications to enable the user to build highly-customizable fax solutions. Res_fax_digium provides core fax processing functionality in the form of several supported fax modems — V.21, V.27ter, V.29, and V.17 — to achieve speeds up to 14400bps.
Fax For Asterisk provides the functionality to send and receive faxes to / from TDM and IP channels — TDM channels are established across Sangoma telephony boards and IP channels can use regular G.711 audio encoding or T.38 encapsulation.
Faxes transmitted and received by Fax For Asterisk begin and end as TIFF image files. TIFF files may be readily converted into or from other formats using standard Linux command-line utilities.
Fax for Asterisk is no longer required to fax in Switchvox 6.x or higher.
Free Fax Channel for Asterisk
Fax For Asterisk and Free Fax For Asterisk are provided for 32-bit and 64 bit x86 Linux systems.
Asterisk versions 12 and earlier are supported. Asterisk version 13 or later does not support Fax For Asterisk.
For more information read our Fax for Asterisk FAQ.