This is a spoof number. It is scammers from India telling you that: they are with Microsoft and your computer is infected with dozens of Trojans; they are Cisco Certified Technicians and they can fix your computer, they are Aldebaran Solutions who are contracted by ATT to rid your computer of viruses, etc.
They also use Toll Free Caller 877-614-7554 and 908-223-5023. Those with caller ID don't pick up.