I too received a call from this number 4 times last wednesday.
Sadly I didn't attend them. I am noot in the US .. I am in DubaI.
When i googled it, shows that it is one HP Company offices
Matt Burdick
Hewlett-Packard
Phone: 415-857-6143
Fax: 415-852-3762
[email protected]
It seems HP is helping intelligence some how.