RFC3840 For FoIP Routing?
In our testing, we’ve found that FoIP with T.38 over the open Internet – no carriers involved – is even more reliable than PSTN fax for just about any call. The big difference? No carrier routing and no TDM-IP conversion. It’s T.38 end-to-end.
So, how do we approach that ideal with carriers responsible for the routing? You might know that the FoIP Task Groups of the SIP and i3 Forums have been performing extensive testing of FoIP in international calls. And it hasn’t been pretty. In most cases, it was the carrier’s first exposure to FoIP qualification, leading to significant problems with equipment and network interoperability and configuration.