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Portal Software Joins Wireless Application Protocol (WAP) Forum

Portal to participate in industry body to define billing capabilities for wireless Internet services

Cupertino, Calif., (December 7, 1999) - Portal Software Inc. (NASDAQ: PRSF), a leading provider of business infrastructure software for Internet and next-generation communications services, today announced that it has joined the Wireless Application Protocol (WAP) Forum. The WAP Forum is an industry association comprising more than 245 members that has developed the de-facto world standard for wireless information and telephony services on digital mobile phones and other wireless terminals. The primary goal of the WAP Forum is to bring together companies from all segments of the wireless industry value chain to ensure product interoperability and growth of the wireless market.

"Multi-vendor product interoperability is essential for the growth of wireless Internet applications," said Scott Goldman, chief executive officer of the WAP Forum. "Portal shares this vision with the WAP Forum, and I am pleased that the company has joined the Forum in order to achieve this goal."

WAP is the de-facto worldwide standard for providing Internet communications and advanced telephony services on digital mobile phones, pagers, personal digital assistants and other wireless terminals. The charter of the WAP Forum is to bring together service providers, handset and infrastructure manufacturers, Internet content provider and application developers to ensure interoperability and growth of wireless Internet-based services.

"Billing is an extremely important element of the technology infrastructure wireless carriers require to support the emerging wireless Internet applications," said Bassam Khan, director of product marketing. "Our participation in the WAP Forum is a clear indication of Portal's commitment to providing the market with solutions that are based on global standards."

With wireless and Internet technologies rapidly converging, traditional wireless carriers need to be able to offer a new class of mobile Internet services. As a result, these companies are facing a number of challenges and require a business infrastructure that supports IP-oriented business models, integrates with current systems already in place and can manage tens of millions of subscribers.

Portal's Infranet® 6.0 delivers the industry's only comprehensive real-time customer management and billing software that was designed to support today's dynamic wireless Internet business environment. Infranet 6.0 can easily integrate with existing wireless billing systems and provides a complete range of powerful, rating and billing capabilities for providers of high speed wireless data and WAP-based services. Infranet's comprehensive real-time technology enables wireless carriers and data service providers to better manage customers, quickly deploy new IP-based services and pricing options, support substantial subscriber growth and unlock new revenue opportunities.

About Portal

Portal Software, Inc., is building business infrastructure for the Internet. Based in Cupertino, Calif., Portal is a leading provider of customer management and billing software for Internet and emerging, next-generation communications services. The company’s comprehensive real-time solution enables service providers to manage customers, support services and collect money. Portal’s customers include US West, Qwest Communications, Covad, Inktomi, Juno Online, T-Online, France Telecom and Demon Interactive.

This press release may contain certain forward-looking statements that relate to Portal Software’s future business and financial performance. Such statements are subject to a number of risks and uncertainties that may cause the actual events or future results to differ from those discussed herein. Such factors include: Portal’s limited operating history, fluctuating quarterly operating results, expectation of continued losses, market acceptance of Portal’s Infranet product, reliance on its direct sales force to sell Infranet, concentrated customer base, reliance on systems integrators and other strategic relationships, ability to manage growth, ability to attract and retain key personnel, the continued growth of the Internet and Internet-based systems and dependence on proprietary rights.