iBasis Helps Millions of Moms Celebrate

Company's VoIP Network Carried Record 43 Million Minutes

BURLINGTON, MA— April 12, 2006 — iBasis, the global VoIP company™, announced today that it carried an all-time record volume for U.S. Mother's Day. On May 14, 2006, the Company carried over 43 million minutes of traffic. This represents a 60% increase from Mother's Day 2005.

The Company also announced that it marketed its Pingo® web-based offering (www.pingo.com) with FTD.com, so that mothers who received FTD® flower arrangements also received a promotion to open a free trial Pingo account.

"We always look forward to Mother's Day," said Ofer Gneezy, President and CEO. "In any given year it is one of our highest volume days. Such enormous traffic gives us the chance to confirm the superiority of our sophisticated network signaling and routing capabilities.

"Aside from proving the endurance and sheer capacity of The iBasis Network™, our ability to carry so much traffic in a reliable manner is an important signal to our major carrier customers, including retail VoIP providers whose use of our services continues to grow. As VoIP and traditional end-users alike keep calling over our thousands of routes around the world, we are thrilled to solidify iBasis' position as the enabling network for so many."

About iBasis Founded in 1996, iBasis (OTCBB: IBAS) is a leading wholesale carrier of international long distance telephone calls and a provider of retail prepaid calling services, including the Pingo® web-based offering (www.pingo.com) and disposable calling cards, which are sold through major distributors and available at retail stores throughout the U.S. iBasis customers include many of the largest telecommunications carriers, including AT&T, Cable & Wireless, China Mobile, China Unicom, MCI, Sprint, Skype, and Telefonica. iBasis carried 7.8 billion minutes of international voice over IP (VoIP) traffic in 2005, and is one of the ten largest carriers of international voice traffic in the world¹. For four consecutive years service providers named iBasis the best international wholesale carrier in ATLANTIC-ACM's annual International Wholesale Carrier Report Card². iBasis was also ranked among the fastest-growing technology companies in New England in the 2002, 2003, and 2004 Technology Fast 50 programs sponsored by Deloitte & Touche. The Company can be reached at its worldwide headquarters in Burlington, Massachusetts, USA at 781-505-7500 or on the Internet at www.ibasis.com.