中文摘要：

随着NGN网络及3GIMS应用的发展,基于SIP的多媒体会议系统受到了越来越多的关注.然而基于SIP的多媒体会议相关标准和产品还不成熟.针对此问题,研究了IETFSIPPING、XCON工作组关于SIP多媒体会议系统的相关标准,设计并实现了一种基于SIP的可扩展多媒体会议系统.该系统利用模块化设计方式,不同的会议功能由相对独立的模块实现,具有良好的可扩展性.测试结果表明系统实现了多媒体会议的功能,符合IETF多媒体会议标准,具有较高的通用性.

英文摘要：

With the development of NGN and 3G IMS applications, SIP-based multimedia conference system has received more and more attention. At present, SIP-based multimedia conference products and related standards are not yet mature. To solve this problem, the standards of SIP-based multimedia conference system proposed by SIPPING and XCON working groups are studied. A SIP-based multimedia conference system is designed and implemented. The System has high scalability in that it is designed in a highly modular manner and different conferencing function is implemented with different module. The experiment results show that conferencing applications can be realized. The conference system complies with IETF standards and has interoperability.