

	iBasis Announces Hosted VoCore Solution Backed by Cisco, Hewlett-Packard, Software.com and EMC Enables Service Providers to Quickly Deliver New Services, Generate More Revenue, Increase Customer Loyalty SUPERCOMM, Atlanta, GA., June 5, 2000 - iBasis (Nasdaq: IBAS), the leader in advanced Internet-based communications, today announced immediate availability of a comprehensive, hosted VoCore (UC) solution for service providers. The iBasis hosted VoCore solution enables CLECs, ASPs and ISPs to quickly and efficiently deliver new, value-added services that integrate email, voicemail, fax, real-time communications and the Web to enhance personal, group and enterprise-wide communication and productivity. The iBasis UC solution puts control of communications in the hands of service subscribers - enabling them to choose when, how (phone, pager, standard PC mail client,) and from whom they will receive calls and messages. iBasis UC solutions also provide advanced, real-time communications capabilities, such as instant callback from within voicemail, call/message notification and screening and "find me/follow me" calling services that enhance mobile accessibility for users and increase call completion rates for providers. Market research firm Ovum projects that VoCore will represent a $5.5 billion opportunity for service providers by 2002. Ubiquitous Internet access and the proliferation of mobile devices is driving demand for new solutions that can help end users manage their communications more efficiently. At the same time, increasing competition among service providers is driving demand for enhanced service capabilities that increase profit margins and customer loyalty. The iBasis hosted VoCore solution deliver on both counts. "With today's announcement, we are delivering truly unified, Internet standards-based communications services. Our VoCore solution goes well beyond mere message access, enabling service providers to quickly and cost-efficiently offer device independent, real-time voice and data services," said Ofer Gneezy, iBasis president and CEO. "UC from iBasis offers an 'apps on tap' approach that enables service providers to respond quickly to new market opportunities by leveraging the applications infrastructure and operational efficiencies of a comprehensive hosted solution." Powered by technology from industry leaders Cisco Systems, Hewlett-Packard, Software.com and EMC, (See also today: HP, Cisco and Software.com Create First End-to-end IP-based VoCore Solution) the iBasis VoCore solution leverages a scalable and extensible IP infrastructure and the company's expertise in IP service operations and management. In addition, the iBasis UC solution is backed by the same world-class engineering and 24X7 global network management teams that have enabled iBasis to become the VoIP provider of choice for 11 of the top 12 international carriers in the US and the only IP communications provider to offer Service Level Agreements for VoIP. "Cisco, HP, and Software.com are working with iBasis to help service providers respond to the unprecedented worldwide demand for enhanced communications services," said Bill Wolfe, general manager for the VoCore Software Business Unit at Cisco Systems. "iBasis understands that VoCore is a breakthrough technology, enabling for the first time, a broad range of multimedia capabilities including voice, voicemail, e-mail, fax and other media types that can be easily integrated with other Internet-based services. iBasis' flexible, hosted solution enables service providers to immediately pursue this significant market opportunity with minimal capital investment." A Complete, Future-proof, Extensible Platform Demand for VoCore services is growing rapidly. The Philips Group predicts that converged network solutions such as VoCore will triple the demand for outsourced services by 2004. And US Bancorp Piper Jaffray estimates that the communications Application Service Provider (ASP) market, driven by new services such as UC, will reach $7.2 billion by 2003. iBasis is the first IP-based communications service provider to address this rapidly growing market with a complete, flexible hosted UC solution for service providers. Backed by world-class IP communications and network operations teams, the iBasis UC solution is integrated with the iBasis Network™, recognized for its proven ability to service the world's largest carriers. Driven by a fiercely competitive environment fueled by deregulation and the increasing commoditization of basic communications services, both next-generation service providers and incumbent carriers alike are aggressively seeking new, higher growth, higher margin revenue sources to expand market share. VoCore from iBasis offers a competitive edge to service providers, enabling them to deliver new, feature-rich services that strengthen customer loyalty and enhance subscriber productivity and responsiveness. Unlike unified messaging solutions to date, VoCore from iBasis uses an open, highly scalable and extensible platform that surpasses traditional store-and-forward messaging to deliver integrated, real-time inbound and outbound communications capabilities - independent of location or device. By delivering advanced, intelligent call management services such as message notification and directory dialing services, the iBasis hosted UC solution helps service providers quickly deploy a broad range of robust, Internet-centric voice applications. Backed by iBasis Expertise in IP Communications iBasis delivers VoCore as a comprehensive, flexible, hosted solution enabling service providers to leverage iBasis' unmatched IP communications infrastructure and expertise, including: An established, global VoIP footprint that offers efficient, worldwide reach A 24X7 Network Operations Center (NOC) iBasis' proprietary Assured Quality Routing™ (AQR) technology for carrier-grade performance; Sophisticated network management, service personalization, IP billing and mediation, and operational support systems to ensure high service availability and redundancy Global teams of highly experienced IP architects and application development, NOC, database, storage and traffic engineers; iBasis Unified Service Manager Simplifies Deployment, Management, Customer Care Developed by iBasis and delivered to its service provider customers as part of its hosted VoCore solution, the Unified Service Manager is an XML-based application that simplifies service deployment, subscriber provisioning and personalization, and ongoing service management, including IP billing and mediation. The Unified Service Manager shields providers from the complexities of back-end service integration and management and provides access to the iBasis UC Knowledge Base, a repository of service data and call detail records that offers business intelligence on customer usage patterns. The Unified Service Manager also offers providers a customizable, brandable interface through which its subscribers can personalize elements of the iBasis UC solution, including preferences and parameters for message notification and single number reach. "As the Internet and mobile communications drive consumer demand for enhanced IP-based services, hosted VoCore solutions such as UC from iBasis, will help providers deliver these new services quickly and reliably," said Mark Winther, group vice president, Worldwide Telecommunications, International Data Corporation. "Service providers who outsource the infrastructure and ongoing management complexities of VoCore to experienced global IP-based communications service providers like iBasis will be first to market and be able to more efficiently manage growth and ensure the quality of these new services." Integrated Technology from Industry Leaders Available to service providers immediately, iBasis' hosted VoCore solution operates on key hardware and software from HP, Cisco Systems and Software.com as well as world-class enterprise storage capabilities from EMC - all seamlessly integrated and tested to ensure carrier-grade performance, scalability and reliability. Included in the iBasis UC solution are: Hewlett-Packard carrier-grade servers Cisco's uOne software and networking infrastructure; Software.com's InterMail platform, the world's leading Internet-based email platform with more than 75 million users worldwide; and, EMC's robust enterprise storage systems iBasis VoCore features include: � Message Management: Full-featured voice messaging, PC and telephone access, Web-based system and user administration, inbound fax, fax redirect/outbound fax, text-to-speech (fax headers, e-mail) Notification Services: Subscriber notification indicates new incoming messages Single Number Reach: Personalizable "find-me, follow-me" services Call Screening: Caller name identification capability Instant Callback: Automatic inbound number capture and single-button call return from within voicemail 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. More than 70 international carriers are iBasis customers, including 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. iBasis has a long-standing strategic relationship with Cisco, as an alliance partner, an ecosystem partner, and one of only 21 Cisco service provider global accounts. 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 iBasis' other SEC filings. Assured Quality Routing is a registered trademark and iBasis and The iBasis Network are trademarks of iBasis, Inc. Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc.