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I cannot hear the phone number being dialed when I try to dial out, so I suspect that the speaker on my modem doesn't work
Explanation: You cannot hear anything on your modem's speaker, making it difficult to troubleshoot dialing or connection problems.
Diagnosis: First of all, you need to make sure that the modem actually is dialing or performing other tasks, before you can conclude that the problem is silence from the modem speaker. It is possible that the modem simply isn't working properly and if it isn't doing anything, there won't be anything to hear in any event. A common reason why the speaker won't make any sound is that the AT command to disable it has been used. Finally, some modems don't have a built-in speaker; sometimes these are "voice" modems that use a connector on the back of the modem intended to be fed to a set of external speakers.