How It Works
The Internet began by moving data from one location to another location. This worked well when you want to send document.
Then people got tired of typing every word they want to say to the next broke across the globe.
Someone decided to change the voice into document file and then expect the other broke miles away to change that document back into voice.
Some basic rules have to be laid down first before the other broke can understand what the document "sounds like".
Thus we have the VOIP - Voice over Internet Protocol.