With today’s technology, the fax send-receive resource is a software-based function; it’s no longer a hardware thing, and PBX manufacturers are beginning to take advantage of this by making fax an inherent function in the software-based PBX, just like voice messaging. Distributed PBXs need fax relay to move faxes around the distributed system, then either TerminatingT38 or BladeWare is needed for send-receive duties.