AC will work with anything. It is only the limitations of the hardware you are using that keeps you from doing something. For example, my networked fax machine can send faxes from AC via a modem or an Internet connection. I am not sure what is going on with your fax modem connection, because ours takes about two seconds. There is something seriously wrong with your set up. What happens if you just send a fax to someone? It is probably the software you are using with your fax machine? Are you using WinFax? You may wish to consider changing to a more robust fax machine such as a networked digital PC to Fax and Fax to PC machine like a Brother. Lots of information on them on here in Tips and Tricks or otherwise. Many other companies such as Toshiba, Muratec, Canon, Xerox, etc. have fax machines (usually with printers/scanners/copiers as well) which have fax software which are basically drivers where each workstation can "print" to the fax machine.
Internet fax is different. Yes it can be faster. My machine can use Internet fax easily, but the machine on the other end must be Internet capable, and this willh ave to wait until the teenagers finally set things up. We are way behind on that one. Ours can also email to fax, but you would have to have the same setup or use a third party program such as eFax or Ring Central in which case you could Internet fax directly from each PC, but it costs about 7 cents per page.
HTH
