The external call transfer – is the call transfer to a telephone line other than the company’s telephone line. The internal call transfer – the transfer of an incoming call to another addressee registered on the same telephone line.
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.