iBasis Joins i3forum To Contribute to Development of International VoIP Interconnection Guidelines

Company to Share Expertise in International VoIP to Help Telecom Industry Transition

BURLINGTON, Mass. – 03/09/2009 – iBasis (NASDAQ: IBAS), a KPN affiliate, today announced it has joined the i3forum as an Associate Member. The i3forum seeks to facilitate efficient migration of voice and multimedia services to Internet protocol (IP) by examining interconnection requirements and related business models for carriers and services, and by establishing technical and service standards for the industry at large. Starting with international interconnections, the organization will explore and promote IP-based services innovation. i3forum members account for more than 70 percent of todays international voice traffic.

The i3forums goal is to standardize best-practices and regulations for migrating thousands of existing TDM international voice bilaterals to IP interconnects an area where iBasis has particular expertise, said Ajay Joseph, chief technology officer of iBasis. With over a decade of work in this realm encompassing diverse markets, network types and standards development efforts, and as a leading carrier of international voice traffic were eager to add value where we can to help ensure the continued growth and progress of global telecommunications.

On the technical side, one of the first objectives of the i3forum is to recommend a range of network architectures, based on existing standards specified by international bodies such as the ITU-T and the IETF, in order to create secure and quality-of-service-compliant bilateral VoIP interconnections. iBasis and other members will work on the development of international service interconnection requirements for different players and services. Ultimately, the goal is for end-users to be able to enjoy, on an international basis, IP-enabled services and applications such as streaming video, high-bandwidth conferencing, and voice calls across all networks.

One of the true pioneers of VoIP, iBasis was purely a VoIP wholesale carrier for the first ten years of its existence. The company deployed its overlay network in major telecom hubs around the world and developed patented and patent-pending technologies to achieve quality of service comparable to traditional wholesale TDM service. Today, iBasis is one of the three largest carriers of international voice traffic globally, as well as a provider of retail prepaid calling services and enhanced services for mobile operators. iBasis continues to operate one of the worlds most extensive and technologically advanced international VoIP networks.
About i3forum
The i3forum was founded in 2007 by eight major International Carriers: AT&T, Deutsche Telekom, Orange, SingTel, Telecom Italia Sparkle, Telekomunikacja Polska, Telefonica International Wholesale Services, and Teliasonera International Carrier. At the time, these carriers represented over 40% of international, carrier-to-carrier voice traffic. Fifteen additional carriers have joined the initiative: Rogers, Telus, Tata Communications, Sprint, iBasis, Verizon, British Telecom, Belgacom ICS, Telkom Austria, SFR, Telkom South Africa, Etisalat, PLDT/Smart, NTT, Telecom New Zealand International. With extensive fixed and mobile expertise, the i3forum is committed to helping the telecommunications industry transition its international bilateral voice to IP by fostering a faster and more efficient migration. For more information contact the i3forum Chair, Philippe Millet, France Telecom Orange.

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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 property of thier 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, and we have no current intention to update any forward-looking statements.