It is a call which is made over internet protocol (VoIP). For example,
one can call using Google Voice to other recipient located miles away. Such
call can also be international.
Appears on the computer screen by the arrival of the call or fax. By the arrival of a call “Call Controller” not only identifies the caller but also gives you a list of variants: to accept the call, reject it, send a voicemail or send an answer as a text message which will be instantly converted into speech and will sound to the caller.