

	Israeli Carrier Barak Establishes Strategic Alliance with iBasis For Internet Telephony and Advanced IP-based Communications Services Israeli Carrier To Route Traffic Over iBasis' Global Network; Provide Termination For iBasis Traffic in Israel Burlington, Mass.-March 15, 2000-iBasis, Inc., (Nasdaq: IBAS), a leading Internet-based communications service provider today announced that it has signed an agreement with the Israeli carrier Barak for Internet telephony and other advanced IP-based communications services. Barak is a leading Israeli telecommunications provider that is part of the Global One alliance, established by communications giants Sprint, France Telecom and Deutsche Telekom. As part of the agreement between the two companies, Barak will be able to route international voice and fax traffic over the iBasis Network™, the world's largest Cisco Powered Network for Internet Telephony, and will terminate international traffic for iBasis in Israel. In addition, the agreement establishes a broader strategic relationship between the companies that enables Barak to offer its customers other advanced services from iBasis, including VoCore. "Barak's technologically advanced infrastructure and broad range of communications services are excellent complements to our global IP infrastructure and vision for advanced Internet-based communications," said Ofer Gneezy, president and CEO of iBasis. "Our partnership with Barak extends our reach into the rapidly growing Israeli market." "Our cooperation with iBasis strengthens Barak's position as a leading supplier of Internet-based communications services for leading companies in Israel and the world." said Avi Patir, CEO of Barak. "With their proven quality and strategic focus on advanced Internet-based communications services, our partnership with iBasis will help us respond to our customers growing demand for international service and enhanced offerings, such as VoCore." VoCore from iBasis The strategic relationship established by the Internet telephony agreement between the two companies enables Barak to offer its customers other advanced IP-based services from iBasis, including VoCore. iBasis and Cisco Systems recently announced that they are joining forces to deliver carrier-class, IP-based, VoCore services. iBasis is deploying in its global network Cisco's VoCore (UC) solution, called uOne™ (Cisco Open Network Exchange.) uOne uses the open Internet Protocol (IP) standard to unify communications methods that were previously disjointed, including e-mail, fax machines, voice mail systems, cellular phones, and the Web. uOne enables users to initiate and return voice calls and send and receive faxes, e-mail, and voice messages- independent of location, time or device. iBasis will offer VoCore to service providers as an outsourced or hosted solution. 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 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. iBasis customers include more than 60 international carriers and 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. About Barak Barak was created by the communications giants Sprint, France Telecom and Deutsche Telekom, who were also jointly responsible for the founding of the global communications company Global One, which is represented in Israel by Barak. Barak provides a wide variety of telecommunications services to and from Israel, encompassing more than 65 countries around the world. 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 8, 2000, and the company's other SEC filings. ### iBasis, 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.