H.323 :- This protocol has become the international standard for all communication over packet-switched networks. This includes LAN, WAN and even the general internet networks we all connect to. H.323 is considered an umbrella that includes all types of standards, which is what the internet is based on. H.323 focuses on voice, video, and data communications, designed specifically to operate over IP networks. At this point, this protocol has become the world market leader for voice and voice communications over IP networks. H.323 was developed by the international telecommunications union, which is the organization responsible for building the public telephone network. 