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同步协作是计算机支持的协同工作研究的一个重要领域，告知服务器为群组的同步协作提供了感知的实现技术。告知服务要求有效地向群组用户投递事件消息。ＩＰ组播技术是服务于群组的通信技术，被广泛用于视音频群组通信。但目前许多告知服务器实现仍然采用点对点的通信技术。在多媒体远程协作系统中，直接利用ＩＰ组播技术实现了可靠的告知服务，并初步分析了ＩＰ组播在以太网络上的实现方式和实现可靠性的条件。
Synchronous collaboration is an important area of computer-supported collaborative work research, telling the server to provide perceptual implementation technologies for group collaboration. Tells the service to effectively deliver event messages to group users. IP multicast technology is a group communication technology that is widely used for video and audio group communication. But many tell the server to still adopt the point-to-point communication technology. In the multimedia remote cooperation system, the direct notification service is realized by using the IP multicast technology, and the realization mode of the IP multicast on the Ethernet network and the conditions for realizing the reliability are preliminarily analyzed.