Telecom companies use MER Telemanagement Solutions' (MTS) products to keep tabs on crafty callers. The company develops, sells, and services software designed to track communications costs, recover charges payable by third parties, and detect and prevent phone system abuse. The company distributes its products directly through subsidiaries in Brazil, Hong Kong, the Netherlands, and the US, and through OEM partnerships with Siemens, Phillips, and other vendors. Its products are used by more than 60,000 customers in 60 countries. Chairman Chaim Mer controls about 40% of MTS.