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This paper offers a solution for internet broadcast system by using SIP protocol. The broadcast system can change the point-to-point calling mode to the point-to-multipoint calling mode, and also can overcome the limitation of NAT and ROUTER on the internet environment. The broadcast system advances IP phone’s function, so IP phones can not only make a phone call but also broadcast. The SIP-based Broadcast System can do broadcast, scheduled broadcast, class bell, setting broadcast group, grouping broadcast, adding some groups on broadcast ,cancelling some groups on broadcast. This paper focuses on two topics: 1. The research and implementation of SIP and RTP protocol. 2. The research and implementation of SIP-based broadcast system.
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