hello,
An ATA gateway allows you to connect any analog phone device to our 3CX Phone System. In essence, it converts from an analog phone signal to SIP, letting us use, any standard analog phone handset with our 3CX IP PBX! You could use your long range portable phone, a bunch of handsets that seem a waste to throw away, a fax machine, or any other analog phone device.
Yes, you can connect an analog fax machine to your phone system but the ATA you select must support T.38 protocol. Also, your FXO must support T.38 and even then it is tricky to get it all working. I'd recommend keeping the fax machine outside your PBX (if possible) or using the 3CX fax server.
horelcool