Indian voice claiming to be from the IRS demands a return call to the above number or else legal consequences will be taken. You are offered a choice of speaking to an IRS representative by pressing 1, but when you do, a white male voice comes on and says there is no one available. FRAUDULENT?
There is a fairly common IRS or "tax scam" being practiced by scammers in both Canada and the USA.
USA tax payers should read this:
http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
Note particularly the links at that site, warning of the scam!