H.323 is a communications protocol standard developed by the International Telecommunication Union (ITU) that enables audio, video, and data conferencing over packet-switched networks, such as the internet. It is an umbrella term for a suite of protocols that define the signaling, media control, and transport of multimedia data.
H.323 has been widely used for videoconferencing and multimedia communications. It provides features such as call setup, media negotiation, bandwidth management, and error correction. It also supports various codecs for audio and video compression, allowing for efficient transmission over networks with varying bandwidth capacities.