H.323 is a protocol used for transmitting real-time video and audio data over a packet-switched network such as the Internet Protocol. It is a standard protocol for multimedia communications. The H.323 protocol is maintained by Study Group 16 within the Telecommunications Standardization Sector of the ITU (International Telecommunications Union), also known as ITU-T. Most VoIP applications use the H.323 protocol because they support call transfer, call setup, and call drop. A key feature of the H.323 protocol is QoS (Quality of Service), which allows real-time traffic management and prioritization to be placed over Ethernet. In addition to packet-switched networking, it also supports multimedia communications over the Public Switched Telephone Network (PSTN), 3G mobile networks, and Integrated Services Digital Network (ISDN). In 1996, the International Telecommunications Union (ITU) released the first version of H.323 with the significance of enabling video conferencing over a LAN (Local Area Network). It was quickly implemented by businesses over an IP network (including WAN) as a means of transmitting audio communications....