Tekelec, is a provider of telecommunications network systems and software applications. The Company’s customers include mobile or wireless communications operators and traditional landline or wireline telecommunications operators. It offers systems and software applications for signaling and session control, applications that enable service providers to measure, manage and monetize the communication services they provide and mobile messaging applications that enable mobile service providers to support their text-messaging growth. It derives its applications from its portfolio of systems, software and related professional services that it designs, develops, manufactures, markets, sells and supports. In December 2008, the Company acquired mBalance Group B.V. (mBalance) a developer of messaging solutions. In January 2008, the Company acquired Estacado Systems, LLC (Estacado), a developer of session initiation protocol (SIP) technology.