What is voip?

 Voice over Internet Protocol

       

       definition:

(VoIP) is a technology that enables you to make and receive phone calls through  the Internet instead of using  the traditional analogy  PSTN (Public Switched  Telephone Network) lines.

            In Voice over ip   the classic public switch telephone system 

        audio is converted to packets and it passes along the network. It

        is a full duplex(two way)  voice transmission over broadband. It is also

        called IP telephony, internet telephony ,voice over broadband, 

        broadband telephony.   

How it works.

         When we call on the internet . The voice change to digital signal 

       and from analogue and compressed

        

     ( compress mean’s to make the data size smaller) , 

      And afterward  this data is encapsulated and is  move

      

      (Moving is done by routing,  data is rout from one router to another 

     

      and finally reach its destination )

.    

     (Encapsulation : change data to packet  is called encapsulation )

    

     And as it reach's  it’s destination it changes back to analogue signal

     and produce the voice you sent

   Advantages :

·                       According to public switch telephone network call as your call

          destination    and time increased cast increases.

      This is one of the best major advantage of VoIP .. you can call anywhere        in the world for a very long time absolutely free. Using Skype,

      IMO or Facebook , only internet cast..

·       

           It doesn’t need dedicated path between caller and called party.

  Disadvantage:

      Security Risk:

   

      Data could be hacked because as we know   that we are communicating        on the world wide  internet