Corsair Announces New Milestone in Wireless Fraud Control; Company's PhonePrint System Has Prevented Over 300 Million Fraudulent Calls.

PALO ALTO, Calif.--(BUSINESS WIRE)--Dec. 13, 1999--

Corsair Communications Inc. (Nasdaq:CAIR) today announced that the company's PhonePrint(R) fraud prevention system has now torn down (or prevented) more than 300 million fraudulent cell phone calls worldwide. The company's last milestone was 250 million teardowns, logged in July 1999.

"Our PhonePrint fraud prevention system is on the job every day guarding wireless customers and network operators in the United States and eleven other countries in Asia and Latin America," said Tom Meyer, Corsair Communications president and chief executive officer. "This new milestone represents hundreds of millions of dollars in wireless revenue protected by Corsair's products."

The Corsair PhonePrint anti-fraud system is based upon a technology called radio frequency (RF) fingerprinting. Originally developed for military applications, RF fingerprinting is used by Corsair's PhonePrint to characterize each cellular handset, quickly creating a unique electronic signature (or RF fingerprint) for every phone in markets that have analog (AMPS or ETACS) infrastructure. A fraudulently programmed (or cloned) phone can replicate the handset ID, but cannot duplicate its RF signal characteristics. Corsair's PhonePrint system maintains a database of cell phone fingerprints, and can detect and disconnect (or tear down) a cloned handset in real time -- before the call can be set up by a mobile switch in a cellular network.

"RF fingerprinting has provided wireless carriers in North America with an extremely effective tool against technical fraud attack", said Tom McClure, assistant vice president for wireless security for the CTIA.

"Ericsson Telecom AB markets the PhonePrint system in several parts of the world, initially in Asia where cloning is a big problem for analog operators," said Ulf Lofven, Ericsson regional manager fraud and security solutions in Malaysia. "PhonePrint delivers a proven antifraud solution, when deployed by itself or with authentication and profiling systems."

Corsair also protects roaming customers through the PhonePrint Roaming Network(R), which delivers more than one million roamer fingerprints daily for verification throughout the United States and Latin America.

About Corsair Communications

Corsair is a leading provider of software and system solutions for the global wireless industry. The company's products include systems for fraud prevention and prepaid billing. Corsair's PhonePrint(R) wireless fraud prevention system is currently installed in over 180 markets worldwide, and has prevented more than 300 million fraudulent cellular calls. The company's PrePay(TM) wireless billing system supports more than 6 million wireless subscribers. More information can be found on the company's Web site at www.corsair.com.

Note: This press release may contain forward-looking statements that involve risks and uncertainties. Actual results may differ materially because of various risks, including risks associated with product sales and installation, economic and political instability in international markets, demand for Corsair's products and services, continued growth of the wireless telecommunications industry, and other risks associated with Corsair's business. For an expanded discussion on such risks, please see the documents filed by Corsair Communications with the U.S. Securities and Exchange Commission.