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Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.I suspect that a setting on your phone is wrong, or has changed, eliminating the 'someone is trying to call you' beep signal.
Please tell me, is your phone service landline, or is it digital phone service through a COX box and an internet connection, or the like? The exact setting to restore or set would depend upon this.