Quacks like POTS, Must be POTS

Martin is on the same page as me, whew it was getting lonely out there. As far as the consumer is concerned the “looks like a duck, quacks like a duck” test is really simple. Can I plug my standard POTS phone into it? If so, and it uses a PSTN number, it’s a duck. Aswath disagrees, and makes some good points!