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My company added 'Defender' (a dial back system) to thwart the 'war games' style hacker.
My Modem line was registered in the system. I called in with my password on the phone (no caller ID back then). The system responded (voice) 'I will call you back'. You had YOUR modem ready for incoming (auto answer or manual).
Lots of fun if you were not at your normal (registered) place.
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