A Look at H.323
From: The VoIP Essentials Series
By: Ken Camp
In 1995, the ITU-T began work on a series of standardized signaling protocols. One outgrowth of this work was a product called The Internet Phone from VocalTec. Initially, this was a proprietary solution and did not focus on interworking between the PSTN and Internet. Transmission of audio signals and the idea of video conferencing over the Internet were key issues. These standards fell within the H.323 family of protocols for multimedia transmission over packet networks and were to some extent an outgrowth and extension of H.320 ISDN videoconferencing standards.
Interworking with the PSTN quickly became a major focal point of this technological development work. Designers recognized the need to incorporate some method for calls to cross over from the IP network to the PSTN. This led to efforts in gateway protocols and connectivity to the SS7 network, which provides extensive signaling (command and control) functionality in the PSTN. H.323 products began to appear from vendors in 1996.
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