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iBasis Names Mark S. Lefebvre Vice President of Operations; Jonathan D. Draluck Vice President of Business Affairs and General Counsel

BURLINGTON, Mass.-June 15, 2000- iBasis, Inc., (Nasdaq: IBAS), the leader in advanced Internet-based communications, today announced that Mark S. Lefebvre, formerly vice president of Data Services Engineering at Broadwing (formerly IXC Communications), has been named vice president of Operations. The company also announced that Jonathan D. Draluck, previously an attorney with Swidler Berlin Shereff Friedman, LLP, a prominent Washington, D.C. law firm specializing in telecommunications, has been appointed vice president of Business Affairs and General Counsel.

As vice president of Business Affairs and general counsel at iBasis, Jonathan Draluck is responsible for promoting the company's business interests through industry and regulatory channels and for providing advice on a broad range of legal issues.

"Mark and Jonathan bring a wealth of experience to our rapidly growing global communications business," said Ofer Gneezy, president and CEO, iBasis, Inc. "Mark's leadership will play an important role in enabling iBasis to execute on our aggressive network roll-out strategy, while maintaining the quality of service that has brought us 11 of the top 12 US international carriers as customers. Jonathan's expertise in identifying competitive opportunities and advocating for open markets will help iBasis remain ahead of the curve as we expand into additional countries and provide our customers new, enhanced IP-based communications services."

Mark S. Lefebvre, Vice President of Operations 
As the former vice president of Data Services Engineering at Broadwing Communications, Lefebvre brings more than 10 years of network and IP services experience to iBasis. Prior to Broadwing Communications, Lefebvre was assistant vice president of Internet Engineering at BBN Corporation and was responsible for the company's network design and engineering services, as well as deployment and support of BBN's tier one ISP infrastructure. While at BBN, Lefebvre built a dial-up network for AOL and a private, real-time voice, video and data Internet for DARPA. Previously, Lefebvre held senior technical and managerial positions with BBN and Computervision Corporation.

Lefebvre has a B.A. from the University of Massachusetts and an M.A. and Ph.D. from Kansas State University.

Jonathan D. Draluck, Vice President of Business Affairs and General Counsel
As a former telecommunications attorney with Swidler Berlin Shereff Friedman, LLP, Draluck offers iBasis substantial experience in obtaining favorable terms for network interconnection, traffic exchange, and use of network elements. In the firm's transactional practice, Draluck counseled arbitrageurs and institutional investors on regulatory issues related to mergers and acquisitions. Previously, Draluck spent six years at the U.S. Federal Trade Commission's Bureau of Competition, where he litigated antitrust matters, served as Attorney Advisor to the Director, and worked in Bucharest, Romania as an advisor to the Romanian Ministry of Finance on the implementation of that country's first competition law.

Draluck holds a Bachelor of Arts degree from the University of Pennsylvania and a J.D. from Emory University.

About iBasis
Founded in 1996, iBasis (Nasdaq: IBAS) is the leader in advanced Internet-based communications. iBasis has built the world's first global IP network that delivers toll quality voice and fax service and other advanced hosted communications solutions, including OneCoreSM VoCore, to global tier one carriers and other service providers. The iBasis Network is the world's largest international Cisco Powered Network for Internet telephony. More than 70 international carriers are iBasis customers, including 11 of the top 12 US international carriers. The company can be reached at its worldwide headquarters in Burlington, Mass., USA at 781-505-7500 or on the Internet at www.ibasis.net.

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Except for historical information, all of the expectations, projections and assumptions contained in the foregoing press release constitute forward-looking statements under the Private Securities Litigation Reform Act of 1995 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, the considerations described as “Risk Factors” in iBasis’ prospectus dated March 9, 2000, and the company’s other SEC filings.

iBasis, iBasis Internet Telephony Hosting, The iBasis Network and Assured Quality Routing are registered trademarks of iBasis, Inc.  Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc.