In telecommunications the automatic call-back is a computer telephone function which allows the user by the engaged addressee’s line or in the other case of the subscriber’s inaccessibility indicating the system to save the number of the called subscriber and make the call when the line will be available or when the called number is not engaged.
The service that most owners look for is VoIP or voice over internet protocol. This service allows the user to make long distance calls using the standard internet connection