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I want call waiting to interrupt my connection (so I can tell when someone is trying to call in) but it doesn't work
Explanation: You have only one phone line in use for both voice and data calls. You want to be able to use your phone line for your modem, but you also need to be reachable if someone wants to call you. You were hoping that by getting call waiting, this would enable an incoming call to knock off your modem connection when necessary so you could get your voice calls, but it does not seem to work.
Diagnosis: When a call comes through on call waiting, an audible beep is generated that indicates the incoming call. To the modem, this is just an interruption of the signal, and many older modems would immediately terminate their connection with the remote host upon detecting it. The "problem" here is that many modems today have advanced error-detection capabilities that allow them to maintain a connection despite this sort of line noise. When a modem does this, you will experience a pause of a few seconds as the modem recovers from the interruption, but the call will continue. There often is not much you can do about this.