Get yourself (9) 2500 sets, (9) modular blocks, and (9) pairs of inside wire to the router block.
Verify the PSTN numbers, and put a Post-It note on each phone, numbered from 1 to 9.
Disconnect the PBX.
Schedule a vendor meet with AT&T. Be sure to invite your customer to observe.
Demonstrate the problem, using just the SLT's.
Ring into, and then leave off-hook, each phone in turn. Use a cell phone with its speakerphone turned on to do this, as a "nothing up my sleeve" proof.
* The cost of the phones is minimal.
* The cost of your labor is minimal.
* The look on their faces when you do your little dog & pony show and prove that they are FOS....
"Priceless."
