I have a SPA112 hooked up to a fax machine. I set up a Fax extension and configured the SPA112 successfully. I can send a fax without issue, but cannot receive. Like it doesn't even get to the ATA. My gut is telling me it's something to do with the inbound rule. I have it set to "Send FAX to" and then the fax extension. I don't want to buy a Welltech just to have that fail as well. Especially since I can only find one vendor for those, like they're well past EoL.