Glossary
The 3GPP, a body that comprises wireless infrastructure, handset, and service providers throughout the world, has defined the H.324M Protocol as the videoconferencing standard for circuit-switched 3G networks.
H.324M is an umbrella protocol defined by the ITU to enable multimedia communication over mobile networks. This protocol defines multimedia communication algorithms and protocols for Public Switched Telephony Networks (PSTN). H.324 terminals provide real-time video, audio, or data (or any combination of the three) between two or more multimedia terminals (through an MCU) over a PSTN voice band network connection.
Requirements were added to the H.324 Protocol to support terminal mobility, and H.324 Annex C with mobile extensions was ratified. H.324 with Annex C was renamed H.324M (M for mobility) for use in mobile circuit-switched networks. In 1999, the 3GPP adopted H.324M with some modifications, mainly in CODECS (voice by AMR and Video by H.263, MPEG-4 simple profile, or H.264) and error handling requirements (H.223 Annex A and Annex B as mandatory). Thus, 3G-324M was born.
3G-324M is the only means today for 3G video telephony over circuit switched networks. It runs over WCDMA and TD-SCDMA networks, mainly in Europe and Asia Pacific.
An important aspect in 3G-324M is call setup times, which is covered through H.324 Annex K.
RADVISION provides multiple solutions for 3G-324M developers and service providers:
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