
Rising demand for affordable communication services across the globe and improving wireless and wired network infrastructure is fuelling the growth of voice over internet protocol (VoIP) services market. Voice over Internet Protocol (VoIP) is a methodology used for communication. It uses various technologies such as IP telephony, voice over broadband, and internet telephony among others to provide communication services over a packet switched network (IP data network). In order avail VoIP services major components are VoIP software, network and terminal equipment. Additionally, the network component s consist of several other components such as gateways, switches, routers and others to carry voice and data content over the IP based network. The terminal equipment can be a regular telephone, VoIP phone, computer or mobile phone. There are several protocols used to implement VoIP services such as H.323, Session Initiation Protocol (SIP), Inter Asterisk eXchange (IAX), Real Time Protocol (RTP), and Media Gateway Control Protocol (MGCP), among others.