Just called. Kept ringing - for some reason never went to voicemail so eventually answered just to stop the ringing. Silence on other end and then hangup.
Call, picked up on last ring. Silent on other end. Assume it's an autodialer from a telemarketing firm. Have been recieving a lot of these types of calls over the past few weeks, from different numbers, but all originating in western states (I live in Ontario).