We use Primus for our phone (and internet) and they offer a telemarketing guard at no charge. It intercepts the suspected telemarketers and gives them the option of either hanging up (without your phone ringing) or recording their business name and then letting your phone ring. When it rings, you get the recording and can choose to answer it, report it as a telemarketer (so that number will not get through again) or send it to voicemail. The best part is that you don't have to talk to the telemarketer. Since this service started (beginning of the summer) I get maybe 1 call a month that tries to get through.