When I answered caller was talking to someone within their location.  As soon as they realized that I had answered they hung up.  When trying to call them back the number was described as a non working number.  (thus telemarketer),  Believe they have called before with same response.  This and all my phone numbers are on the Do Not Call Lists but it doesn't seem to matter.

Rude and unwanted interruption.  Gave no reason for the call.