What is Ip telephony (VOIP)
IP Telephony or VOIP ( Voice Over Internet Protocol) is the transmission of telephone calls over a data network. this is accomplished by packetization of the voice streams. VOIP enables users to make telephone calls over a data network like the Internet.
VOIP converts the voice signal from the telephone into a digital signal that can be transmitted across the data network. At the receiving end the signal gets converted back to voice.