It is illegal to impersonate a police officer, and your phone number is available to the telemarketer so they'll refer it to the police themselves. A friend of mine thought it would be funny to do this to a telemarketer by pretending he was the police and the telemarketer reported him. The police paid my friend a visit at his home and reprimanded him. The telemarketing firm records calls for quality assurance and the conversation with my friend pretending to be the police was there on an audio file that the police were able to hear. My friend had no way of making up an excuse to the police. Thankfully my friend was only given a stern warning. The telemarketer is a legitimate company working as a third party solicitor for my friend's cable TV subscription upgrade offer. What you think might be funny could get you into some serious trouble