I was on a call when this number came in. looked online first to see if it was residential or company. called back, busy signal.
After a little searching, it appears to be either from a telecommunications place in Mesa/Phoenix, AZ called Eschelon Telecom, Inc, which is now acquired by Integra, or a customer on their service.. I work for a different telecommunications company here which from what I know you should be able to call Eschelon/Integra and tell them to block this number due to annoyance calls.