Repeated calls from a fax machine multiple times a day every day. I googled the number and it's attached to several brokerage houses.  See this website:
goliath.ecnext.com

HERE is the company responsible for having the fax call our offices. Go to goliath.ecnext.com and you'll see that they are an information provider service (for a fee).  Send complaints to:
Eric Culp - 614-682-5116 or customer support 614-682-5105, 866-4ECNEXT

ECNext - 9200 Worthington Road, Suite 301, Westerville,OH 43082
www.ecnext.com
Phone: 614-682-5103
Fax: 614-682-5104

keep getting calls at various hours of night and day from this number

I work at ECNext as the telecommunications administrator.  This number is not one of ours, so please do not ask anyone at ECNext about this.  The previous poster is correct that this number traces back to some addresses in Manhattan that house financial institutions.  Those places have no idea of this number or anyone associated with it either, so contacting them is futile as well.  The number is currently disconnected, so probably bogus if you are getting calls on it now.  Please complain to the proper FCC/FTC authorities and check with your phone company to see where the calls may be coming from.  Thanks.