Charge-A-Call Payphone

[soundsystems]

Hello All,
I've recently acquired a NOS Charge-A-Call Payphone from the early 90's.  It was manufactured by CTG (Commercial Telephone Group, Inc.).  I've scoured the internet looking for information, and have found none.  Upon connecting to a landline, the telephone does receive a dial tone, but any attempt to key a phone number results in a self-generated busy signal.  Does anyone on the forum have documentation pertaining to this telephone?  Thanks for reading my post, and thanks in advance if you can help!
Regards,
Jason

[Phonesrfun]

I would think that anyone here having anything on it would be a long shot.  Later pay phones have lots of software in them that was probably proprietary.  Do you have any pictures?

[poplar1]

I thought these were just standard phones inside--no coin handling so no relays or special software and no locally produced dial tone, busy tone, or synthesized voice.

ISTR the WE equivalent was a model 10A. They were connected to lines that did not allow toll (long distance) calls or even local calls to be connected unless charges were paid--either by giving a credit card number to the operator or by entering same info at the "bong" tone. In other words, the lines were restricted but the phones were not.

[poplar1]

Does it look like this one?

http://thechocolate-shop.com/131152384124P-charge-a-call-coinless-pay-phone

[Payphone installer]

C-A-C payphones first operated as dumb sets on a special CO based line that prompted the user for a credit card. Later on there were smart CAC phones just like smart payphones. They were produced by several companies some still work just by plugging them in others need a pro gem download. AT&T 31A and 60A both need to talk to a master server to work.