This number is some type of fax service. I get several faxes from them each week. They usually consist of mortgage refinance offers or term life insurance. The form asks you to fill out some personal info and fax it back to 877-301-7630
There's also a number to call to take your number off the list: 877-877-0718
. I did that today. I don't trust them of course, but they have my number already so thought I'd give it a try.
These types of services tend to call in the middle of the night sending faxes and also calling blocks of numbers to find which ones have faxes attached to them.