A call possibly originating from this number arrived today, and it rolled to voice mail. Somewhat surprisingly, the caller must not have used an automated dialer, as a voice said, "Hello" followed by a name, then hung up a few seconds later without leaving a sales or other message.  If this was a telemarketer, the call was specifically directed at me, rather than nobody in particular.  Googling the area code and number failed not only to identify the subscriber of the number, but also to specify whether it was landline or cellular.  If others receive a call from this number and report it, that may shed some light.  For now, the caller must be considered unknown.