I have a couple of changes to make on the system today so I figured I would put a call into their provider and see what they have going on on their side.

I have a larger office bldg in town that has multiple DID's running to a common fax for multiple business' and have never had a problem with any of them.

The difference is the two locations are two different providers so could very well be the case that this provider is using a soft switch. Thanks Ed I'll make sure to ask.