Modular Structure for Software Implementation of H.323 Multimedia Conferencing Terminal

The ITU-T H.323 standard defines the components, protocols and procedures for making multimedia conferencing over packet-switched networks such as the Internet. Although the standard gives many guidelines to the developers, it does not have enough information to implement the whole system. Some of the important parts including capture and playback of audiovisual signal, user control, low-level synchronization and networking are outside the scope of the H.323 standard and need to be defined by the developers. In this paper, a modular design is developed for software implementation of an H.323 terminal in a desktop environment. The design is flexible enough to include further enhancement of the system.