Introduction of VOIP
VOIP stand for voice over internet protocol. VoIP, also known as IP Telephony, is the real-time transmission of voice signals using the Internet Protocol (IP) over the public Internet or a private data network.1 In simpler terms, VoIP converts the voice signal from your telephone into a digital signal that travels over the Internet. One of the most significant advantages of VoIP (over a traditional public switched telephone network (PSTN - also known as a legacy networks) is that one can make a long distance phone call and bypass the toll charge. This integrated voice/data solution allows large organizations (with the funding to make the transfer from a legacy network to a VoIP network) to carry voice applications over their existing data networks. Not only will this technological advancement have an impact on the large traditional telecommunications industry, it will alter the pricing and cost structures of traditional telephony.2 Furthermore, when compared with circuit-switched services (yet another name for legacy networks), IP networks can carry 5 to 10 times the number of voice calls over the same bandwidth.
Working of VOIP
In VOIP to send human voice on internet protocol the human voice must be packetized to send voice. Voice packetization involves appending headers with routing information to the voice data. Multiple voice samples are combined into a packet and the voice packet is switched hop-by-hop through the network. The process of packetization compresses the caller’s voice signal, transfers it over the IP network and it is then decompressed at the other end
There are two fundamental technologies that are necessary for the existence of VoIP. The first, and most widely used, is the telephone. The second technology is the Internet. The telephone was as direct result of the (independent) work of Alexander Gram. Early telephones were leased in pairs to subscribers. The subscriber was required to put up their own line to...