How does the PSS standard differ from terminal standards such as H.323 and H.324?

A. The main difference is that H.323 and H.324 are used for 2-way communication, typically in a videoconferencing scenario. The 3GPP Packet-Switched streaming standard is instead aimed at one-way video streaming applications, such as Video on Demand (VoD) or viewing a live camera source (e.g. Web-cam).

Note that some companies have developed gateways which can bridge between the standards (e.g. To allow a standard H.324 terminal to receive audiovisual content originating from a PSS server). More.

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