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d3crypt

Calling a payphone with a dial up modem

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So i called my local payphone (818) 506-9335 with my dial up modem and Interestingly enough it handshakes and everything. I had my terminal encoding set to IBM-850 and I got this:   TC!*8185069335*93180*DD4322*2027*016*1504257225303*90245*

 

I know that payphones have a remote management mode, and I'm thinking that this might be it. Anyone have any ideas?

 

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Yup, that it is! I don't know much about the protocol, but for what it's worth, I called it and got something slightly different;

 

TC!*8185069335*93230*DD4322*2027*016*1504272145310*90245*

 

Judging by how the second field went up by 50, I'm guessing that might be some kind of internal, non-resettable coin counter or something. Also, the first digit of the firmware code (DD4xxx) indicates model number. It goes something like:

 

8xxx = Protel 8000

7xxx = Protel 7000

6xxx = Protel 2000/6000

4xxx = Protel 4000

 

A good while ago, I found an image on Protel's FTP that explained firmware versions. No idea if I still have a copy lying around somewhere. Programs like Expressnet will work with whatever weird protocol the phones speak, but the phone will also want a four digit passcode (the same as the one used to hear the coinbox value from the phone) before letting you do anything.

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Can i get a copy expressnet from you?

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So that's what those tones are!

For a while I didn't know what the deal was with payphones screaming at me when I gave them a call.

Thanks for sharing!

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