When you call someone by a VoIP telephone, your voice (analog) signals are converted into digital signals which travel over the internet. These digital signals are converted back into voice (analog) signals at the other end and heard as normal voice by the person you call. This may sound as yet another way to send and receive voice signals much like the normal telephone network. But it has certain advantages:
- When you talk over a VoIP connection, you are using internet instead of the telephone cables. Therefore you don't have to pay for the charges of a telephone company.
- When you talk to somebody, the other person listens to what you say and then replies. Then you remain silent and listen.
In this way there are always silent patches during any conversation. On a normal telephone network, these 'silent patches' are also carried over the cable lines for which you have to pay the charges.
This is because the traditional network cannot tell the difference between useful transmission of voice and useless "silent patches". But the VoIP does. It cuts out useless parts by Packet Switching, saving you unnecessary charges.
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