Same as the 4 posts above.  Did not pick up.  Only received a call from them on one occasion

Received a few calls from this number in the past few days also. I've never answered, but I called back once. The directory has no reference to what business it is, or the purpose of their call.

Had a missed call from this number. When I dialed it I got a message that the voicemail box is full.

Received calls several times during past 3-4 days. They usually hang up right away.  Sometimes I have an impression that they're in a car or in a calling center.  Nobody ever responds.

They called.  I picked up.  They hung up immediately.