iBasis' iTrac™ Service Enables Customers To Maximize Return on Internet Telephony

Company's Web-based Service Provides Analysis of VoIP Traffic Quality, Volume

Burlington, Mass.—January 10, 2000—iBasis, Inc., (NASDAQ: IBAS), the leader in international Internet telephony, today announced iTrac™, a Web-based service that provides customers up-to-date information about the international voice and fax traffic they send and receive using the iBasis Network™. iTrac enables communications service providers to improve their network planning, respond more quickly to market opportunities and maximize revenues.

iTrac, (Interactive Traffic Analysis Center™,) provides customers with interactive analysis tools and critical data about their iBasis Network activity, including the total minutes of voice and fax traffic, total number of calls, call completion ratios and average call duration. iTrac data is organized for analysis by country of origin and termination. By analyzing their global VoIP traffic with iTrac, iBasis customers can streamline their network planning processes and optimize their utilization of voice-over-Internet-Protocol (VoIP) and the iBasis Network, the world's largest international Cisco Powered Network for Internet telephony.

"iTrac provides our customers with unprecedented ease of access to timely information about their traffic," said Charles V. Giambalvo, senior vice president of Worldwide Sales, iBasis. "With this service, network intelligence for the telecommunications industry is finally available at Internet speed."

About iBasis 
Founded in 1996, iBasis (NASDAQ: IBAS) is the global leader in international Internet telephony. iBasis uniquely combines a superior technology platform, premium Internet bandwidth and proprietary Assured Quality Routing™ (AQR) software to deliver toll quality Internet telephony services to tier one carriers and other international service providers. The iBasis Network™, a global, high-capacity Internet communications network, 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.net.

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 the company's prospectus dated November 9, 1999, and the company's other SEC filings.

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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.