Voice over Internet Protocol (VoIP)
Voice over Internet Protocol (VoIP) allows you to use broadband Internet connection to make telephone calls. So instead of using regular (or analog) phone line, the voice can be transmitted digitally. It is also known as an Internet Voice technology. The analog data i.e. voice (vibration variation) is converted into an electrical current by the microphone. The amplitude of this current is measured 8000 times per second. Each reading is then coded in binary codes of 8 bits. The physical layer is responsible for attaching Ethernet header to the VOIP frame and sending the data from the sender to the receiver. The frame level transmission is handled by data link layer including the functionalities like Byte or Bit stuffing, Checksum, Frame Format etc. The network layer adds IP packet header containing routing information and control information associated with data gram delivery. The session layer handles the duties of communication establishment and security details specifications. The function of the Transport Layer is to examine the QoS(Quality of Service) parameters and enhance the QoS provided by the Network Layer.