What is FOIP - Fax over IP?
FOIP stands for Fax over IP and refers to the process of sending and receiving faxes via a VOIP network.
Fax over IP works via T38 and requires a T38 capable VOIP gateway as well as a T38 capable fax machine, fax card or fax software. Fax server software that can talk 'T38' allows sending and receiving faxes directly via a VOIP gateway and, consequently, does not need any additional fax hardware.
3CX includes a T38 compatible fax server service in its 3CX Phone System for Windows. Other fax servers currently in the market require the use of separately licensed EICON SoftIP or Cantata FOIP drivers to send and receive faxes without fax hardware.
Links:
What is T38?
How does Fax work in VOIP environments?
IP PBX, SIP & VOIP common questions 
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