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That seems like an odd way to run a phone system. Couldn't I keep someone from making any outgoing calls just by calling them once, and leaving my phone off the hook?



It varies a lot, or at least it used to. Keeping the phone line open and expecting a callback is a scam so classic it's even in the first edition of "Practical Unix (now "and Internet") Security" in the section on securing your modem pool.

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It's very frustrating hearing someone walking around when they think they've disconnected but they haven't.

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