I have received several calls from this number in the past few days... and multiple calls each day.
I don't pick up and it will ring for ever... 25 rings... unlike other robo calls that hang up after 5 rings.
Reverse search says it is a landline in Lexington MA.
Just got this call on 9/6/14 at 12:30pm. This is the second call I received from this number. Does not talk when I answer and then hangs up. The first call came 9/4/14 at 8:30pm. I'm wondering if it their way of finding out "good" numbers and then they will sell their "list" that they are compiling to a spammer.