There was no message and I couldn't get an answer when phoned back.

Strategic Communications, Ottawa.   http://www.stratcom.ca/contact/Their receptionist admitted it was their outgoing number, said the machine must be set wrong, then added that sometimes a representative was not available to speak with the people called with their predictive dialer. She most very generously offered to remove my number from their list. That doesn't help all the other people whose day is interrupted for a call that hangs up when they answer. Perhaps the do-not-call list should apply to polling companies as well.