What is Voice Over Internet Protocol?
VoIP is the process of sending sound or voice over the internet. In a typical call using the current technology, the voice starts as an analog signal. When the sound reaches the transmitter in the phone, the vibrations are turned into electrical impulses. The impulses are transmitted over a pair of wires to the central office switch. The switch processes the electrical impulses into digital information. This process is known as Analog to Digital or Digital to Analog (A to D / D to A). This digital signal is transmitted to a distant switch over a connection called a trunk circuit. The main function of a telephone switch is to connect the callers phone to the called party phone and convert analog signals to digital information. The network of switches used every day in the United States is known as the Public Switched Telephone Network (PSTN). There are two sides to a switch, first is the line side connection which is a two-wire circuit that connects the phone to the switch. This connect
