H.323
H.323 is an ITU-T standard protocol suite for multimedia communication over packet-based networks, such as IP networks. It defines how audio, video, and data conferencing are transmitted and managed, including call setup, control, and teardown. Originally developed for video conferencing over LANs, it has been widely used in VoIP and unified communications systems.
Developers should learn H.323 when working on legacy or enterprise video conferencing systems, VoIP implementations, or interoperability with older telecommunication equipment. It is particularly useful in scenarios requiring standardized multimedia communication across different vendors or in regulated industries where compliance with established protocols is necessary, such as in healthcare or government sectors.