BeVocal and iBasis Connect To Expand
VoiceXML Development in Europe

BeVocal Leverages iBasis' Global VoIP Network to Provide Software Tools and Local Access to European Speech Application Developers

BURLINGTON, Mass- EUROPEAN VOICE PORTAL SUMMIT; LONDON - April 23, 2001 - BeVocal, an award-winning provider of voice infrastructure software, applications and services, and iBasis, Inc., (Nasdaq: IBAS), the leader in advanced Internet-based voice communications today announced that BeVocal will use The iBasis Network to provide European speech application developers with local access to BeVocal's advanced speech application development environment. The relationship with iBasis enables BeVocal to combine the powerful development tools and resources of the BeVocal Café, a leading VoiceXML development environment, with the carrier-class quality and global reach of The iBasis Network, the world's largest international Cisco Powered Network for Internet telephony.

Benefits to VoiceXML Developers
The BeVocal-iBasis relationship offers speech application developers European telephone number access to the BeVocal Café, delivering significant cost-savings for European developers who want to use the BeVocal Café to test and demonstrate applications for customers. Using the service, developers will incur ordinary telephone charges for dialing into the UK access number on the iBasis VoIP network. iBasis will then provide long-distance voice service from the U.K. to the BeVocal Café data center, located in Sunnyvale, California, where the speech applications will be hosted. These international access services are intended to encourage the development of VoiceXML applications that can leverage the high quality VoIP infrastructure of The iBasis Network. These services are offered at no additional cost to VoiceXML developers who want to test and demonstrate their applications. Initial availability will be in the U.K. with plans to extend services to developers in selected cities in Europe and Asia.

Free VoiceXML Training Events
iBasis also plans to work together with BeVocal to promote VoiceXML development in Europe and will co-sponsor a series of free VoiceXML training events for European developers beginning in London on May 17 and 18. For more information or to register for VoiceXML training please visit http://cafe.bevocal.com.

"Our relationship with BeVocal is part of our commitment to be the leading provider of connectivity, infrastructure, and enhanced services in the emerging speech solutions market," said Ofer Gneezy, president and CEO of iBasis. "With a VoIP infrastructure that already carries millions of minutes of phone traffic every day for the world's largest and most demanding carriers, iBasis provides speech application developers and their customers a global IP network optimized for the distribution of voice services and content."

"BeVocal has seen exceptional growth in the U.S. voice developer community, and currently serves registered developers in over 30 countries," said Mikael Berner, BeVocal co-founder and CEO. " With this in mind, we chose to partner with a global network provider that could support BeVocal Café developers with the infrastructure they need to easily run and deploy applications in their local market, further encouraging the international expansion of the VoiceXML developer community. Our partnership with iBasis will further extend the reach of our developer program into worldwide markets overnight."

"The availability of hosted, global development and delivery environments is critical to the growth of speech-enabled applications and services. We expect worldwide revenues generated from speech-enabled services delivered by mobile carriers to grow by about 130%, and revenues from speech-enabled enterprise solutions to grow by at least 230% between 2000-2007," said Elka Popova, Program Leader, Voice/ Data Convergence, of Frost & Sullivan, a leading industry analyst firm. "With today's announcement, iBasis and BeVocal are helping VoiceXML developers more quickly bring the benefits of speech-enabled phone services to European customers."

The iBasis Network: Carrier-Class VoIP
The iBasis Network is a robust, global platform for the delivery of IP-based communications services, including wholesale, phone-to-phone VoIP and enhanced services, such as unified communications and speech-enabled business solutions. The company's global network delivers IP-based voice services using Internet Telephony equipment from Cisco Systems deployed in large, carrier-class switching and application hosting facilities called Internet Central OfficesTM, strategically located in Amsterdam, Cambridge (Mass.), Frankfurt, Hong Kong, London, Los Angeles, Miami, New York, Paris, Singapore, Stockholm, Sydney, Tokyo, and Toronto. The network also comprises numerous smaller points of presence called Internet Branch OfficesTM, which play an important role in connecting providers to iBasis services. With this global infrastructure in more than 45 countries and through its relationships with other communications providers, iBasis can provide IP-based voice services virtually anywhere in the world. iBasis is the only provider that guarantees service quality by offering the industry's first Service Level Agreement (SLA) for VoIP (Voice-over-Internet-Protocol). The key to maintaining the high level of quality required by the world's largest carriers is the company's proven, proprietary Assured Quality RoutingTM (AQRTM) technology. At the company's 24 x 7 Network Operations Centers (NOC) in Burlington, Mass., USA and Hong Kong, the nerve centers of The iBasis Network, engineers continuously monitor the global circuit-switched (PSTN) and packet-switched (IP) networks to ensure the highest quality of service to customers worldwide.

About The BeVocal Café
The BeVocal Café (http://cafe.bevocal.com/) is a free Web-based VoiceXML development environment that provides developers with a complete set of tools and resources for creating high quality speech applications. Using the BeVocal Café, developers can build advanced, scaleable speech applications using a standard Web browser and an ordinary telephone. In addition to the industry's top-ranked VoiceXML interpreter, the BeVocal Café is the only VoiceXML 1.0-compliant development environment providing all of the following unique features: support for voiceprint verification; support for local and remotely loaded Java-based SpeechObjects; pre-tuned grammars, professional audio, and utility functions for location-based services; and sophisticated tools for usability testing and debugging of applications. In addition, BeVocal provides extensive documentation and training for beginners and advanced VoiceXML developers.

About BeVocal, Inc.
BeVocal is an award-winning provider of voice infrastructure software, applications and services that extend the power of every phone. BeVocal is the first company to create voice portal applications that can be personalized based on a caller's location, delivered to any device and customized via an open development platform. Telecommunications companies and businesses rely on BeVocal's automated phone solutions and scaleable hosting network to offer millions of callers intelligent dial tone services for retrieving information, managing messages and conducting transactions simply by speaking. Developers can build high quality voice applications using BeVocal's Web-based development platform, the BeVocal Café (http://cafe.bevocal.com/), while gaining access to millions of potential customers through BeVocal's carrier partners. CT Labs has ranked the BeVocal Café as the industry's #1 VoiceXML development environment and voice hosting service. BeVocal uses advanced speech recognition technology provided by Nuance Communications (Nasdaq: NUAN). BeVocal is headquartered in Sunnyvale, California. For additional information call 408-907-3200.

About iBasis
Founded in 1996, iBasis (Nasdaq: IBAS) is the leader in advanced Internet-based voice communications. iBasis delivers toll quality international voice services and provides the infrastructure for hosted communications solutions, including unified communications and speech-enabled content, e-commerce and customer service applications. The company's customers include many of the largest enterprises and carriers in the world, including AT&T, Cable & Wireless, China Mobile, China Unicom, Concert, ExxonMobil, Gannett, H&R Block, Home Shopping Network, Morgan Stanley, NTT, Telstra, Sabre Group, Sprint, Western Union, WorldCom, and Verizon. iBasis' hosted, enhanced service solutions include SpeechPortTM, a scalable, customizable platform for speech-enabled business solutions, VoCore^SM unified communications and the IP CallCardTM pre- and post-paid calling card platform. The iBasis Network is the world's largest international Cisco Powered Network for Internet Telephony and the first to receive the Unified Communications-Cisco Powered Network (UC-CPN) designation. iBasis is listed in both the Russell 2000® and Russell 3000® Indexes. 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 .

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 new voice-based Internet services and the timing and amount of revenue generated by these services; (ii) fluctuations in the market for and pricing of VoIP 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, 2000, and the company's other SEC filings.

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Assured Quality Routing and AQR are registered trademarks, VoCore is a service mark and iBasis, The iBasis Network, Internet Central Office, Internet Branch Office, IP CallCard, SpeechPort, IPort, and PriceInteractive are trademarks of iBasis, Inc. or its subsidiaries. Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc. All other trademarks are the property of their respective owners.