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iBasis Announces Date For Selected First Quarter 2007 Financial Results Release and Conference Call

BURLINGTON, MA - DATE - iBasis (NASDAQ: IBAS), the global VoIP company™, today announced that it will report selected first quarter 2007 financial results on Thursday, May 3, 2007, before the opening of the stock market. The Company will host a conference call to discuss the results, led by Ofer Gneezy, its President and CEO, on that same day at 11:00 a.m. EDT. This call will be webcast by Thomson/CCBN. The public is invited to listen to the simultaneous webcast by logging in through the iBasis investor relations website at investor.ibasis.com. The webcast is also being distributed through the Thomson StreetEvents Network to both institutional and individual investors. Individual investors can listen to the call at www.fulldisclosure.com, Thomson/CCBN's individual investor portal, powered by StreetEvents. Institutional investors can access the call via Thomson's password-protected event management site, StreetEvents (www.streetevents.com).

As previously announced, a Special Committee of independent directors appointed by the Board of Directors of the Company has conducted an internal investigation relating to stock options granted to the employees of the Company, the timing of such grants and their related accounting and tax treatment. On October 20, 2006, the Company disclosed that the Special Committee had concluded that the appropriate measurement dates for determining the accounting treatment of certain stock option grants differ from the measurement dates used by the Company in preparing its financial statements. As a result, the Company currently expects to record additional non-cash charges in the range of $10 million to $20 million for stock-based compensation over the period from January 1, 2000 through June 30, 2006 and will accordingly restate its financial statements for that period. The Company is in the process of completing the restatement of its financials for that period. As a result, the Company’s first quarter 2007 financial results will not be available until after the Company has filed it restated financial statements and its Form 10-Q for the third quarter ended September 30, 2006.

About iBasis

Founded in 1996, iBasis (NASDAQ: 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 that 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, Verizon, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica. iBasis carried more than 11 billion minutes of international voice over IP (VoIP) traffic in 2006, and is one of the largest carriers of international voice traffic in the world1. 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.




1 Telegeography 2007 data compared with iBasis 2006 traffic volume

iBasis and Pingo are registered marks; the global VoIP company and The iBasis Network are trademarks of iBasis, Inc. All other trademarks are the property of their respective owners.

Safe Harbor Statement

Except for historical information, all of the expectations, plans and assumptions contained in the foregoing press release constitute forward-looking statements under Section 21E of the Securities Exchange Act of 1934 and involve risks and uncertainties. Important factors that could cause actual results to differ materially from such forward-looking statements include, but are not limited to, (i) the Company's ability to execute its business plan; (ii) the extent of adoption of the Company's services and the timing and amount of revenue and gross profit generated by these services; (iii) fluctuations in the market for and pricing of these services; (iv) the other factors described in the Company's Quarterly Report on Form 10-Q for its most recently completed fiscal quarter and Annual Report on Form 10-K for its most recently completed fiscal year all of which are available at http://www.sec.gov. Such forward-looking statements are only as of the date they are made, and we have no current intention to update any forward-looking statements.