We have a PRI card in the XTS.
We ported over from Verizon all of our lines at the Town Hall to the PRI. All calls but 5 centex lines used to contact centrex offices remotely come through the XTS on the PRI. When we could not get faxes to work through the PRI, we then moved some of the "existing" ported fax lines back to centrex and they are now working aok as faxes but not able to dial using a modem but working on that. We use to have cordless phones that had their own phone lines when we were just digital/centex. At that time we did not have the cordless phones through the XTS due to nothing gained. We had voice mail through our phone provider for everybody and needed digital for offices that had many lines and needed their people to pick up a line if others were busy.
With the addition of the PRI we brought everything through the XTS (except fax)
The cordless work now except for caller id (which somebody said I would need a SLT card with CID) and no voice mail notification but