Fax over IP is a very important and popular feature. Fax over IP makes sending and receiving fax very simple and effective. It is possible to send and receive fax over ip even without any fax machine or any additional hardware. Imagine how useful it is if you would just have to print a document from your computer to send fax to anyone. Or how about getting incoming fax automatically converted to PDF and sent to you as an attachment with email.

We can implement fax support in asterisk. Below is the list of fax implementations we can do in asterisk. 

• Send fax from fax machine connected to ATA
• Receive fax to fax machine connected to ATA
• Send/receive fax between fax machines connected to ATAs
  
• Fax Broadcasting (sending an identical fax to multiple recipients).
• Fax-to-Email Gateway (receiving faxes by e-mail attachments).
• Email-to-Fax Gateway (sending faxes by e-mail attachments)
• Fax Distribution and Fax Routing (delivering faxes automatically) .
• Automatic printing of any fax .
• Sending Alpha-Numeric Pages.
• Polled Retrieval of Facsimile.