iBasis Announces Release Date For First Quarter 2003 Results

BURLINGTON, MASS. - April 8, 2003 - iBasis, Inc. (OTCBB: IBAS), the leader in Internet-based voice communications, today announced that it will report first quarter 2003 financial results on Wednesday, April 23, 2003, before the opening of the stock market.

The company will also host a conference call to discuss the results of the quarter, led by Ofer Gneezy, iBasis president & CEO, on Wednesday, April 23, 2003, at 11:00 AM EST. The public is invited to listen in by logging on at the company's website at www.ibasis.com.

Individual investors can also listen to the call through CCBN's individual investor center at www.companyboardroom.com. Institutional investors can access the call via CCBN's password-protected event management site, StreetEvents (www.streetevents.com).

About iBasis

Founded in 1996, iBasis (OTCBB: IBAS) is a leading provider of wholesale international telecommunications services. Named each of the last two years by service providers as the #1 international wholesale carrier in Atlantic-ACM's annual International Wholesale Carrier Report Card, iBasis is a preferred provider for many of the largest carriers in the world. Customers include AT&T, Cable & Wireless, China Mobile, China Unicom, Sprint, Telefonica, Telenor, Telstra, and WorldCom. The company's global VoIP infrastructure, The iBasis NetworkTM, is the world's largest international Cisco Powered NetworkTM for Internet Telephony. Based on its revenue growth from 1997 through 2001, iBasis was ranked the #8 fastest-growing technology company in North America and the #1 fastest-growing technology company in New England in the Technology Fast 500 national program sponsored by Deloitte & Touche. 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.

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Assured Quality Routing and iBasis are registered marks, The iBasis Network, Internet Central Office, Internet Branch Office, ConnectPoint Global Access, and IP CallCard are trademarks of iBasis, Inc. Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc. All other trademarks are the property of their respective owners.

Except for historical information, all of the expectations, projections and assumptions contained in the foregoing press release, including those relating to the company's current expectations regarding revenue growth, sources of revenue, margin improvement and future capital expenditures 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, (i) the extent of adoption of the company's services and the timing and amount of revenue generated by these services; (ii) fluctuations in the market for and pricing of these services; and (iii) the other considerations described as "Risk Factors" in iBasis' most recent Forms 10-K and 10-Q, and the company's other SEC filings. We have no current intention to update any forward-looking statements.