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OPC server
OPC is open connectivity in industrial automation and the enterprise systems that support industry. Interoperability is assured through the creation and maintenance of open standards specifications. There are currently seven standards specifications completed or in development.

GSM network
GSM is the most popular standard for mobile phones in the world. Its promoter, the GSM Association, estimates that 82% of the global mobile market uses the standard. GSM is used by over 3 billion people across more than 212 countries and territories.

SMS
Short Message Service is a communications protocol allowing the interchange of short text messages between mobile telephone devices. SMS text messaging is the most widely used data application on the planet, with 2.4 billion active users, or 74% of all mobile phone subscribers sending and receiving text messages on their phones.

IVR
Interactive voice response is a technology that allows a computer to detect voice and keypad inputs. IVR technology is used extensively in telecommunications. IVR system can respond with pre-recorded or dynamically generated audio. IVR systems can be used to control almost any function where the interface can be broken down into a series of simple menu choices.