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iBasis Set to Join Russell 3000 Index

BURLINGTON, MASS. - June 12, 2007 - iBasis (NASDAQ: IBAS), the global VoIP company, today announced that it is set to join the broad-market Russell 3000® Index when Russell Investment Group reconstitutes its comprehensive set of U.S. and global equity indexes on June 22, according to a preliminary list of additions posted Monday on www.russell.com.

Membership in the Russell 3000, which remains in place for one year, means automatic inclusion in the large-cap Russell 1000® Index or small-cap Russell 2000® as well as the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market-capitalization rankings and style attributes.

"We're pleased to be included in the Russell 3000 Index, which is very highly regarded among institutional investors," said Ofer Gneezy, president and CEO of iBasis. "This achievement is another step in our momentum that began two years ago with the elimination of our debt and continued with our relisting on Nasdaq last June."

The Russell 3000 serves as the U.S. component to the Russell Global Index, which Russell launched earlier this year.

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. An industry-leading $4 trillion in assets currently are benchmarked to them.

Annual reconstitution of Russell's U.S. indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. The largest 1,000 companies in this ranking comprise the Russell 1000 and the next 2,000 companies become the Russell 2000. These investment tools originated from Russell's multi-manager investment business in the early 1980s when the company saw the need for a more objective, market-driven set of benchmarks in order to evaluate outside investment managers.

About Russell

Russell Investment Group aims to improve financial security for people by providing strategic advice, world-class implementation, state-of-the-art performance benchmarks, and a range of institutional-quality investment products. With more than $200 billion in assets under management, Russell serves individual, institutional and advisor clients in more than 40 countries. Russell provides access to some of the world's best money managers. It helps investors put this access to work in corporate defined benefit and defined contribution plans, and in the life savings of individual investors.

Founded in 1936, Russell is a subsidiary of Northwestern Mutual Life Insurance Company. Headquartered in Tacoma, Wash., U.S., Russell has principal offices in Amsterdam, Auckland, Hong Kong, Johannesburg, London, Melbourne, New York, Paris, San Francisco, Singapore, Sydney, Tokyo and Toronto. Russell's indexes are unmanaged and cannot be investing in directly. For more information on Russell indexes, go to www.russell.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, 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, Telefonica, And Yahoo. 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 Based on Telegeography 2007 and iBasis actual 2006 traffic.

iBasis and Pingo are registered marks, The iBasis Network and the global VoIP company are trademarks of iBasis, Inc. 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, including those relating to the Company's expectation that it will be able to complete the restatement of its prior period financial statements and to file its delinquent periodic reports during June 2007 and the Company's plan to make a submission to the Nasdaq Listing Council asking for additional time to file its periodic reports, 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 inability to meet the requirements of the NASDAQ Stock Market for continued listing of the Company's shares, (ii) the Company's ability to execute its business plan; (iii) the extent of adoption of the Company's services and the timing and amount of revenue and gross profit generated by these services; (iv) fluctuations in the market for and pricing of these services; (v) the success of the Company's plans to contest the FCC ruling on prepaid calling cards; (vi) the ability of the Company and Royal KPN to consummate the proposed transaction due to regulatory restrictions, the failure to receive shareholder approval, the ability to successfully integrate their operations and employees, the ability to realize anticipated synergies, the emergence of new competitive initiatives resulting from rapid technological advances or changes in pricing in the market, business conditions and volatility and uncertainty in the markets that the Company and Royal KPN serve; and (vii) the other factors described in the Company's periodic and current reports, all of which are available at 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.