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From: johnl@iecc.cambridge.ma.us (John R. Levine)
Newsgroups: comp.dcom.telecom
Subject: Re: Pacific Bell "Airport" Credit Phones
Message-ID: <telecom11.293.1@eecs.nwu.edu>
Date: 12 Apr 91 14:14:58 GMT
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X-Telecom-Digest: Volume 11, Issue 293, Message 1 of 11

In article <telecom11.285.2@eecs.nwu.edu> you write:

> This sounds like it is emulating the procedure used by credit card
> verification devices that are normally connected to POS terminals.

Nope, the verification terminals use 300 baud ASCII with the classic
and extremely cheap 103 FSK modem encoding.  I know because a few
years ago when I was at Javelin Software I programmed one of the PCs
on our network to emulate one of them to verify and submit phone order
credit card transactions from the order database.

For payphones, they use DTMF since phones already have DTMF
generators.


Regards,

John Levine, johnl@iecc.cambridge.ma.us, {spdcc|ima|world}!iecc!johnl