Convergys and iBasis Raise the Bar for VoCore With Carrier-class Customer Care Services

iBasis VoCore VoCore Solution Now Offers Convergys' Integrated Subscriber Billing, Collection, and 24x7 Customer Care Services

BURLINGTON, MA, and CINCINNATI, OH; September 5, 2000 - - iBasis, Inc., (Nasdaq: IBAS), the leader in advanced Internet-based communications and Convergys Corporation (NYSE: CVG), the global leader in integrated billing and customer care services, today announced that they have signed an agreement to enhance customer care for iBasis' VoCore (SM) VoCore solution.

Under the terms of the agreement, iBasis' service provider customers will now have the option to extend the professional support services of Convergys to their VoCore subscribers. Convergys is the world leader in integrated billing and customer care services for many of the world's largest carriers.

iBasis VoCore is a hosted VoCore solution that enables service providers like CLECs, ASPs, and ISPs to deliver quickly and efficiently new, value-added services that integrate email, voicemail, fax, real-time communications, and the Web. VoCore delivers control of communications to the service subscribers enabling them to choose when, how (phone, pager, standard PC mail client,) and from whom they will receive calls and messages. iBasis VoCore also provides advanced, real-time communications capabilities - such as one touch callback, outbound calling, message notification and single number reach - with call-screening services that enhance mobile accessibility and increase call completion rates.

With today's announcement, the VoCore solution offers iBasis' service provider customers the option of using Convergys' fully brandable subscriber billing, collection and, customer care services. This new support option has been tightly integrated with the iBasis VoCore solution and features Catalys (SM), Convergys' carrier class subscriber billing, collection, and customer care services. The solution also offers a dedicated contact center staffed 24x7 by expertly trained customer care representatives prepared to handle all subscriber interactions and transactions.

Convergys' outsourced Internet billing and customer care services enable wireless, wireline, cable, and Internet service providers to bring new Internet-based solutions like iBasis VoCore VoCore quickly to market - with minimal up-front capital investment. Key features of this joint solution include e-commerce support, real-time processing capabilities, pre- and post-pay support. Robust self-care features include PDA support, support for multiple ISPs on a single implementation, and international capabilities, including multi-currency and multi-language functionality.

"For many service providers, the need to establish robust customer care is a significant barrier to entry, slowing speed to market and inhibiting delivery of new, enhanced services," said Ofer Gneezy, president and CEO of iBasis. "Convergys offers our customers a world-class solution to these issues, enabling them to more quickly deliver compelling new services such as our VoCore VoCore solution, which create higher margins and stronger customer loyalty."

"Catalys is a unique solution, tailored to meet the demands of leading-edge service providers, like iBasis," said Jim Boyce, president of Convergys Internet Solutions. "Our Catalys solution has been thoroughly tested and expertly integrated with the iBasis VoCore solution and offers the latest in customer service technologies, including the ability to analyze subscriber usage patterns using subscriber data or call detail records."

iBasis' VoCore hosted VoCore solution integrates best-of-breed technologies from Cisco Systems, Hewlett-Packard, Software.com, and EMC. The new subscriber billing, collection, and customer care service options from Convergys have been tightly integrated with VoCore's service provider billing infrastructure technologies.

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 and the first to receive the VoCore Cisco Powered Network (UC-CPN) designation. More than 95 international carriers are iBasis customers including 11 of the top 12 U.S. international carriers. 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

About Convergys
 Convergys Corporation (NYSE: CVG), a member of the S&P 500, is the global leader in providing outsourced, integrated, billing and customer care services, bringing together world-class resources and expertise to help clients transform customer relationships into a competitive advantage. Convergys software produces more than one million bills each day, and Convergys contact centers handle more than one million customer interactions each day. Convergys (SM) provides billing, customer care, and employee care services to the top companies in a wide range of industries, including telecommunications, Internet, cable and broadband services, technology, and financial services. Headquartered in Cincinnati, Ohio, Convergys employs over 42,500 people in its 41 customer contact centers and in its data centers and other offices in the United States, Canada, Israel, and Europe. Convergys is on the Internet at www.convergys.com

Convergys is pronounced: kun VER jis. Convergys and the Convergys logo are service marks of Convergys Corporation.

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' prospectuses dated March 9, 2000, and the company's other SEC filings.

Assured Quality Routing is a registered trademark, VoCore is a service mark and iBasis and The iBasis Network are trademarks of iBasis, Inc. Cisco and Cisco Powered Network are registered trademarks of Cisco Systems, Inc. Russell 2000® and Russell 3000® are registered trademarks of Frank Russell Company.