iBasis Named Best Wholesale Carrier Finalist in World Communication Awards 2009

BURLINGTON, Mass. – 09/03/2009 – iBasis (NASDAQ: IBAS), a KPN affiliate, has been named as a finalist in the Best Wholesale Carrier category for the World Communication Awards 2009 (WCA), one of the most trusted, independent global communications industry events of its kind. The WCA, organized by Terrapinn Media in coordination with its news publication, Total Telecom, recognizes the companies and individuals responsible for the innovations, achievements and great new services that are helping to build tomorrows industry.

The WCA recognition for 2009 follows the completion of the companys integration of acquisitions of KPN Global Carrier Services and TDCs international voice operations, which resulted in 79% growth in minutes, 41% growth in revenue and 49% growth in gross profit in 2008 compared to 2007. iBasis carried approximately 24 billion minutes in voice over IP (VoIP) and time-division multiplexing (TDM) traffic in 2008, placing iBasis among the three largest international voice carriers in the world, according to Telegeography.

Criteria for the WCAs Best Wholesale Carrier category in 2009 included differentiation in cost and quality levels, breadth of international reach and connectivity options, and a focus on growth and innovative business models. In addition to iBasis, finalists for the award include Belgacom ICS, BT Wholesale, NTT Communications and TeliaSonera International Carrier. The winner will be announced on November 25 at the WCAs gala awards evening at the Park Lane Hilton in London. More information about the awards can be found at http://www.worldcommsawards.com.

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 and enhanced services for mobile operators. iBasis customers include KPN, KPN Mobile, E-Plus, BASE, TDC and many other large telecommunications carriers such as Verizon, Vodafone, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica. In October 2007, iBasis acquired KPN Global Carrier Services to create one of the three largest carriers of international voice traffic in the world (1), and KPN became a majority stockholder of iBasis. The company carried approximately 24 billion minutes of international voice traffic in 2008. The Company can be reached at its worldwide headquarters in Burlington, Mass., USA at +1 781-505-7500 or on the Internet at www.ibasis.com.

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1. Based on Telegeography 2009 and iBasis and KPN Global Carrier Services 2008 traffic.

iBasis and KPN are registered marks. All other trademarks are the property of their respective owners.

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 that could cause results to vary materially. For a description of certain of these risks and uncertainties please read the Company’s most recent Annual Report on Form 10-K and other periodic and current reports, all of which are available atwww.sec.gov. Such forward-looking statements are only as of the date they are made.