Choose new Fax number from http://www.freevoiceusa.com
Select VoIP phone service
Select Phone Numbers
Choose a new number with T38 enabled (value 1)
Add to cart and Check out
Next go to (your system).freevoicepbx.com/maint
Select PBX set up
Select Extensions page
Select User to Receive FAX

Scroll down to section
Fax
Enabled? Check box
Fax Email? Enter email to receive Fax and submit

Select the Inbound Routes Page in PBX setup
Add a new route

Enter the description, DID number, and choose destination
Description?:
DID Number?:
Choose Destination -> Fax Recipient
*Do not enter Caller ID Number under Route by Caller ID, leave Blank
Submit, Apply Changes.