This seems to be a logal dial-out hub number for a long distance carrier (Sprint or AT&T?).  I got calls from that number coming from branch offices within my company located in the USA.  The calls I got were legit so, this isn't necessarily a scam.

I think this is a free phone service called happy jack or magic jack or something - people dial into it and then get cheap long distance. Just got a call from my gf that way and didn't recognize the number at first.

j ai recu plusieurs appels de (613) 599-1500 et bell canada me facture les long distancececi est carrément une fraude.

7 phone calls to my toll-free line, no voice mail message, that I have to pay for! When I call this number, told number not in service. Would love to know who they are so I can ask them to stop calling.

This # called me and no one on the other end, just silence.

I see this # however I call and it is out of service....