In the past I have mistakenly connected analog devices to the wrong ports without causing damage. This is considerably different from your description of an end user trying to force a square peg through a round hole.

I would like to see 1 phone connected to a previously unused port and then put that port as first ring. Make a test call to see if all is well, if not then we may have expensive problems to tend to.

How about calling out on a X-100, any problems?