听力原文：M: I've been getting annoying calls for two weeks. When I answer the phone, the other party hangs up without saying anything. I've tried everything including blowing a whistle into the receiver. W: Beginning today, we want you to keep a record of the time each call occurs. From this chart, we can get information to help us trace the calls. If necessary, the telephone company can contact the police. Q: what does the woman suggest that the man do? (16)