I received the same phone from 935-564-3631. The message was "We have been trying to reach you. This call is officially final notice from IRS Internal Revenue Service. The reason of the call is to inform you that IRS is filing lawsuit against you. To get more information about the case file, please call immediately on our department number: 929-800-2848. I repeat 929-800-2848. Thank you.
There is a fairly common IRS or "tax scam" being practiced by scammers on both Canadian and USA residents.
USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam
Short answer:
The IRS never initiates a contact via phone.
They always send a snailmail first.
Educational post:
This scam is also described as scam #11, here:
http://phonehelp.2truth.com/facts_rev.html
Remember to return here, to 800notes.com, after you look at any of the information at that site, either to post more information, or to let us know you avoided the scam, or to read any further information about that number that others may post.