PCFax is an software to fax gateway for the transmission of faxes using Asterisk PBX. Asterisk is an Open Source PBX (or PABX) integrating PSTN telephone lines and VOIP into a single solution, providing all of the functionality of a high end PBX

What that means is that with PCFax and Asterisk you can send faxes from your desktop. PCFax can translate a normal PDF document into a fax message. You simply enter the destination phone number and click send. Its that easy.

If any errors occurring during transmission a error report is sent back to you. You can also preview how the fax will look by sending email to the special 'preview' address, which simply formats the message ready for transmission and then sends it back to you via email for previewing before the fax is sent.

Current features
Built as an extension to Asterisk.
Support PDF file formats
Support for multiple Asterisk Channels as well as group channels
Send faxes without specialized Fax Modems
Just use your existing Asterisk/Digium hardware
Automatic Archiving of all faxes to a designated mailbox.
Automatic Delivery receipts.
Customizable routing of inbound and outbound faxes to specific file system locations, e-mail addresses and more.