软交换中呼叫关系模型与业务视图

针对现有呼叫模型和业务视图不能满足多方多媒体类业务的复杂控制需求的问题，提出了1个基于软交换的呼叫关系模型SBS CRM和以之为基础的通用业务视图（GSV）. SBS CRM/GSV以多方呼叫为基础，支持信令控制与媒体控制分离，向业务层呈现呼叫方视图、媒体链接视图、媒体链接关系视图3个独立的视图，并提供多种粒度的控制能力. 同时，该视图兼容现有的parlay和IN CV视图，加入1个视图转换层则可以接入现有的业务提供平台. 使用该模型的软交换系统验证了该模型的实用性和有效性.

Study on Call Relation Model and Service View of Softswitch

〗Present call model and service view can not satisfy all complex controlling requirements required by multiparty multimedia services. A signaling and bearer separated call relation model (SBS CRM) of softswitch and a general service view (GSV) based on SBS CRM are proposed. SBS CRM/GSV, which is built on multiparty calls, supports the separation of signaling control and media control and provides three service views independently to the service logic: call party view, media link view, and media link relation view. Therefore, SBS CRM/GSV provides multi granularity control capabilities to service. GSV can be adapted to parlay/IN CV by adding a view translation layer between them. The softswitch system with SBS CRM illustrates the practicability and efficiency of SBS CRM/GSV.