PARIS, France and MOUNTAIN VIEW, Calif. - November 6, 2000 - ILOG (NASDAQ, EURO.NM: ILOG) today announced that Orange, the UK's largest and fastest growing mobile phone network, has selected ILOG Rules to automate its new call data record (CDR) processing system CDRA. Powered by ILOG's advanced rule engine software, CDRA can process more than 50 million CDRs per day as it gathers and summarizes network information.

The automation enabled by ILOG Rules will help improve customer service, while also helping Orange offer electronic billing and payment options to its customers via the Internet.

The CDR processing system was created in just three months by a team of two developers, underscoring that ILOG Rules is easy to embed. The fast product development cycle also highlights the significant time-to-market advantages of using the pre-built software components instead of developing the highly-specialized, sophisticated rule engine software in-house. Typically, CDR systems can take up to six months or longer to build, and can be technically challenging due to the inherent complexity of the billing architecture and the amount of data that needs to be correlated with other systems. Performance requirements of these systems are also very challenging, since CDR processing involves triggering thousands of rules per second, while vast amounts of data must be processed in near real time. ILOG consultants participated in the project, expediting development with expertise specific to their products.

"ILOG Rules was ideal for meeting our high performance and scalability requirements," said Nick Martlew, Business Analyst at Orange. "We were able to expedite deployment of the CDR application, and an otherwise complex task was much simplified by the use of ILOG Rules. The maximum flexibility and maintenance offered by the technology are essential in our rapidly expanding system." Orange has more than doubled its customer base in less than nine months.

ILOG Rules enables the seamless integration of business logic into applications, with a fast, lightweight rule engine. It is widely used in alarm filtering and correlation for network management, as well as mediation, billing and marketing automation for the growing customer relationship management (CRM) segment of telecom.

Also available in Java, ILOG Rules externalises application logic as high-level independent rules that can be easily adapted or extended to meet new business requirements.

Orange Plc was recently acquired by France Telecom, which also uses ILOG's rule engine components for CDR processing tasks associated with the leading mobile operator's short message service.

About Orange
Orange provides a broad range of personal communications services. As well as Orange GSM 1800 services, this includes other digital cellular telephone and paging services. As at 30 September 2000, Orange has over 8.3 million customers. Orange is the largest and fastest-growing digital mobile phone network in the UK, with over 7,000 base stations, and more than 10,000 sites targeted by 2001. Orange now offers roaming on over 200 networks in 100 countries. Information about Orange can be found on the Orange website at www.orange.co.uk and media information can be found at www.media.orange.net.

About ILOG
Dually headquartered in Paris and Mountain View, Calif., ILOG is the world's leading supplier of C++ and Java software components. ILOG's embeddable optimization, visualization and business rules software components dramatically shorten the development time of enterprise software applications in the supply chain, telecommunications, transportation and financial services industries. In addition to optimization applications where the company enjoys a significant market share, ILOG is playing an active role in the emergence of the e-Business software components market. Visit www.ilog.com for additional information.

ILOG is a registered trademark, and ILOG Views is a trademark, of ILOG. All other trademarks are the properties of their respective owners.