It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
This program allows you to control the use of the telephone, how many minutes you talk, where you have called, what amount of data is downloaded and so on. Thus, it helps you to fit in the framework of the contract conditions. The program is mainly used in mobile phones.