Fax over VoIP
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Fax over VoIP is not reliable and does not work most of the time.
It is possible to get nearly 100% rate in rare circumstances but is very very low chance to get this.
Wide explanation lies in technology mismatch between FAX and VoIP as explained in Steves' Underwood article here.
Steve Underwood developed SpanDSP package which helped to implement FAX support into Asterisk, Freeswitch and other open-source VoIP platforms.