iBasis Announces Second Quarter 2002 Earnings Release Date and Webcast Information

BURLINGTON, Mass., July 9, 2002 -- iBasis, Inc., (NASDAQ: IBAS), the leader in Internet-based voice communications, today announced that it will report second quarter 2002 financial results on Thursday, July 25, 2002, before market open.

The company will also host a Webcast to discuss the results of the quarter, led by Ofer Gneezy, iBasis president & CEO, on Thursday, July 25, 2002, at 11:00 AM EDT (8:00 AM PDT). Members of the public are invited to listen in by logging on at the company's website at www.ibasis.com.

An archive of the Webcast will also be available beginning July 26th on the Investor Relations section of the iBasis website.

About iBasis

Founded in 1996, iBasis (Nasdaq: IBAS) is the leader in Internet-based voice communications. iBasis delivers toll quality international voice services to many of the largest carriers in the world, including AT&T, Cable & Wireless, China Mobile, China Unicom, Concert, Telefonica, Telenor, Telstra, Sprint, and WorldCom. The iBasis NetworkTM is the world's largest international Cisco Powered NetworkTM for Internet Telephony. 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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iBasis is a registered mark and The iBasis Network is a trademark 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' Annual Report on Form 10-K for its fiscal year ended December 31, 2001, and the company's other SEC filings. We have no current intention to update any forward-looking statements.