That's a good point to mention, Hal. It is true that output ports on IADs, VoIP ATAs, EMTAs and other telephony toys are often used to emulate a real POTS line, but they often don't work.
I had an installation that called for the reuse of a pair in an existing 300 pair aerial cable to send a POTS line from an EMTA. This pair had carried a digital station on a Nortel system to a regular jack. It didn't take long to determine that Spectrum Cable's Arris EMTA lacked the horsepower to push clean dial tone that far. We obtained Viking Electronics' TBB-1B, which is a great per-line device that was developed specifically for these situations. Of course, you will need one per line.
HERE IS THE LINK FOR IT.
