Just tracked it down... this is a Comcast promotions number. They are trying to sell you new services

Getting calls from this number. The guy just wait for an answer from the reciever and hangup.

called me several times. no voicemail and no voice when call is answered.
I am registered on the "do not call" list for advertising.

Have been getting calls for the last couple of weeks. I do not answer, no message is left.

877-253-0731 has been calling me repeatedly for a couple of weeks and doesn't stop.  Please block this number

Has called repeatedly and left no message. When I finally answered someone asked for me, and then hung up.