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!
I received a call yesterday from this number, left message on my answering machine saying it was the IRS. I called back today and never talked to anyone, but I heard them in the background trying to get people's bank and credit card information. They sounded liked they were from India.
My answering machine received the message the same as Firemonkey, this morning.. The voice of the lady scare people into death. I called back but the line was busy. I will check with IRS.
This is a scammer using an untraceable magicJack device, probably from overseas. See: http://800notes.com/Phone.aspx/1-347-832-4519/2#p710251082229542377
for what this means and what you can do about it.
In particular:
In addition to the regular reporting channels, e.g., the Department of the Treasury, the FTC, and your local state attorney general's office, you might also report the abuse to YMAX Corp. I have seen reports that they are pretty good at responding to complaints and may be able to permanently shut off a magicJack device, if necessary, so that it can never be used again.
The YMAX Corp. main web page is at:
http://www.ymaxcorp.com
and their site giving information on how to lodge a complaint is at:
http://www.ymaxcorp.com/contact.html
Note that the "contact" website gives a clickable link to a "live chat" where you can make your complaint.
In the meantime, tell your caller to shove his magicJack into his sphincter ani externus.