Instead of a physical trunk of wires for PSTN lines, SIP trunking provides a virtual trunk over the Internet to PSTN lines. Blasting Fax Server supports FoIP with no in-computer hardware (often referred to as "boardless") , hosted and co-located solutions and even the use of virtual machines at your popular hosting provider.

Sending bulk faxes over T.38 fax relay or G.711 fax pass-through IP networks is fully supported by Blasting Fax Server. But, we must emphasise that we cannot 100% guarantee the compatibility of any sip trunking (sip provider), the SIP Trunks below are based on customer reports. However, we are continually expanding this list as we access and verify interoperability with more FoIP network equipment and SIP trunks, so please check back frequently.