在分组交换网络中，用于视频会议系统的多媒体会话信令协议主要有H。323和SIP。
H. 323 and SIP are the main signaling protocols which control multi-media sessions in a multimedia conference system over the packet network.
该文通过对各种会议拓扑结构的分析和比较，提出了一种以SIP作为控制信令的、集中式拓扑结构的多媒体会议系统。
After analysis and comparisons of various conference topologies, a centralized multimedia conference system using SIP as controlling signaling is pro-posed in this article.
该文通过对各种会议拓扑结构的分析和比较，提出了一种以SIP作为控制信令的、集中式拓扑结构的多媒体会议系统。
After analysis and comparisons of various conference topologies, a centralized multimedia conference system using SIP as controlling signaling is pro-posed in this article.
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