

	iBasis Announces Major VoIP Network Expansion in Europe; Names New Regional Vice President to Drive European Operations Former Teleglobe and FLAG Telecom Executive Tim Walsh to Head Operations for Europe, Middle East and Africa; Company Opens Regional Headquarters in London LONDON, October 2, 2000-iBasis, Inc. (Nasdaq: IBAS), the leader in advanced Internet-based communications, today announced plans to more than triple the number of Internet Central Offices in Europe as part of an aggressive plan to expand its market presence and services in the region. The company also announced that Tim Walsh, a former Teleglobe and FLAG Telecom executive, will lead the company's regional expansion as vice president for Europe, Middle East and Africa (EMEA). Walsh will be based in the company's new regional headquarters in London. iBasis already provides IP-based services to more than 100 international providers, including 11of the top 12 US international carriers, 10 of the top 20 global carriers and has established carrier-class Internet Central OfficeTM facilities in several major European hubs, including London, Frankfurt and Amsterdam. The company is accelerating its service expansion in Europe with deployments of Internet Central Offices in Brussels, Copenhagen, Madrid, Milan, Paris, Stockholm and Zurich expected by the end of this year. iBasis currently provides its toll-quality international services to 13 European carrier customers, including several tier-one providers. "With the continuing deregulation, expansion of mobile services and increased competition in European communications markets, carriers and other service providers in Europe are seeking new opportunities to work with proven providers like iBasis who understand how to deliver toll-quality VoIP and new, enhanced services that unify voice and the Internet," said Ofer Gneezy, president and CEO of iBasis, Inc. "With a proven European communications executive like Tim Walsh driving our regional expansion from our London headquarters, iBasis will have a dynamic market presence in one of the world's largest and fastest growing markets." Tim Walsh brings 19 years of communications experience to iBasis. At Teleglobe Europe, Tim helped launch the company's USA-Europe video-on-fibre network and secure significant communications contracts from major European broadcasters and tier-one telecoms. While at FLAG Telecom, Tim led the expansion of the company's submarine fibre wholesale business. Prior to FLAG, Walsh held senior managerial positions at British Aerospace Communications and Vyvx International, a video-on-fibre subsidiary of Williams Communications. 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 VoCoreSM Unified Communications, to global tier one carriers and other service providers. The iBasis Network is the world's largest international Cisco Powered Network for Internet Telephony and the first to receive the Unified Communications Cisco Powered Network (UC-CPN) designation. More than 100 international service providers are iBasis customers including 11 of the top 12 U.S. international carriers. iBasis is listed in both the Russell 2000Ž and Russell 3000Ž Indexes. 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 . *iBasis customers as compared with US-based international carrier and global carrier lists, as published in Telegeography 2000. 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. Assured Quality Routing and AQR are registered trademarks, VoCore is a service mark and iBasis, The iBasis Network, Internet Central Office and Internet Branch Office are trademarks of iBasis, Inc. Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc.