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呼叫会话控制功能(CSCF,Call Session Control Function)是IP多媒体子系统(IMS,IP Multimedia Subsystem)中最重要的呼叫控制网元,主要负责对IMS网络中的各种会话进行控制管理,所以对其可靠性、可伸缩性、运行高效性等有很高的要求,利用集群技术将一个个独立的CSCF服务器组成CSCF集群则可以满足这些要求。根据CSCF和集群技术的原理提出了两种CSCF集群的实现方法,并对CSCF集群中的负载均衡策略、会话初始协议(SIP,Session Initiation Protocol)流程和互备原理进行了介绍,可供在进行CSCF集群的规划设计和实施建设时参考。
Call Session Control Function (CSCF) is the most important call control network element in the IP Multimedia Subsystem (IMS). It is mainly responsible for the control and management of various sessions in the IMS network. Therefore, Reliability, scalability, operational efficiency and other high requirements, the use of clustering technology will be a separate CSCF server CSCF cluster can meet these requirements. According to the principle of CSCF and cluster technology, two CSCF clusters are proposed, and the load balancing strategy, Session Initiation Protocol (SIP) procedure and interoperability principle in CSCF cluster are introduced. CSCF cluster planning and design and implementation of construction reference.