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The call waiting features are not working.  When I am on the phone and a second call comes in the second caller does not hear the beep signaling that I am on the phone.  If I don't put my current call on hold and answer the second call i lose the call.  Please advise.  This is very frustrating because all cell phone users are accustom to hearing the "beep" to know that you are on the phone.  People calling me are telling me later " I called but it just rang and rang, no answer.