This is the real deal. The IRS is offering a one time refund on the federal excise tax levied on long distance services on landline, cell phone or VOIP(like Vonage) telephone service.
"The IRS will refund to you the taxes on long-distance service billed to you for the period after Feb 28, 2003 and before Aug 1, 2006. Taxpayers should request this refund next year when they file their 2006 tax returns."
http://www.irs.gov/newsroom/article/0,,id=161506,00.html
Make sure you get yours! Not every year that the IRS just says "Ehh, whatever." and offers up a refund like this without requiring a massive pile of reciepts and paperwork from individuals.