Part of the extended divestiture broohahahahaha was that the local telcos had to provide the same "equal access" for coin operated payphones to customer-owned equipment as they did to their own house brands.
This was way, way, too messy on many levels.
At least in NY, and I suspect just about everywhere else, the local telco simply ended that type of access years ago and replaced their own phones (the internal guts, so to speak) with COCOT type "smart" circuitry.
_____________________________________________________ Knowledge may be power, but communications is the key snipped-for-privacy@panix.com [to foil spammers, my address has been double rot-13 encoded]