This number keeps calling me. I just happened to pick it up yesterday and turned out the callers are Indian folks presenting themselves as IRS officers. They are scamming folks with bogus stories. They even make threats suggesting that you committed tax fraud and local sheriff is being dispatched for your arrest unless you pay them thousand of dollars. Just hang up if you did answer, do not fall for this scam!! Do not give out any personal information. They may know your full name, DOB, last digits of SSN, your address and employer. IRS never calls and demand money on the phone paid by pre-paid debit card or wire transfer!

Definetly a scam:
http://www.irs.gov/uac/Newsroom/IRS-Warns-of-Pervasive-Telephone-Scam

Monday July 8,
this number 202 241-6149 called me so several time in the day for months and i never picked up the phone and I suspect then I returned the call this morning and there was no answer and strange noise on the phone. And i tried to Google search this number i couldn't find the owner name.  Finally i found others who have the same problems with this number.  Thank you for sharing. and I have to be aware and let the members of my family knows about this scam with this above phone number.

The IRS contacts people initially by paper mail letter. It will contain a phone number for you to call them back.

I got a phone call from this number couple times this morning telling me he is IRS and found I had a tax Fraud over the last 6 years and want me to report the case right away to them.