I think everyone should fill out form 1088 from the FCC on this number because if there is a 2 second or more delay, it can be considered "war dialing" where companies do this to check and see if the number they are calling is a fax number and it is illegal.
Just received my first call from this number. Caller ID displayed INTERNATIONAL. No message left. Previous such calls from this area code were just as mysterious. Maybe a robo-dialer checking for active phone lines, but I figured the daily calls from UNKNOWN number / NOT_AVAILABLE name was that war machine.
Record the information and Report it to the FCC & DNC