3GPP IMS系统介绍[精品].pptVIP

* * * * * * * * * * * * * * * 第 * 页 S-CSCF业务触发机制 第 * 页 S-CSCF处理MO请求 1, 将SIP请求同该用户档案中的最高优先级的初始过滤准则（IFC）进行匹配 2, 如果该请求与IFC匹配，则S-CSCF将该请求转发给AS if this request matches the initial filter criteria, the S-CSCF shall forward this request to that application server, then check for matching of the next following filter criteria of lower priority, and apply the filter criteria on the SIP method received from the previously contacted application server;- if this request does not match the highest priority initial filter criteria, check for matching of the following filter criteria priorities until one applies; - if no more (or none) of the initial filter criteria apply, the S-CSCF shall forward this request downstream based on the route decision; - in any instance, if the contact of the application server fails, the S-CSCF shall use the default handling associated with the initial Filter Criteria to determine if it shall either terminate the call or let the call continue based on the information in the filter criteria; if the filter criteria does not contain instruction to the S-CSCF regarding the failure of the contact to the application server, the S-CSCF shall let the call continue as the default behaviour. 第 * 页 S-CSCF 会话控制模型 第 * 页 登记和会话建立 CSCF Call Session Control Function P- Proxy S- Serving I- Interrogating HSS Home Subscriber Server UE User Equipment Home Network of UE A Network visited by UE A Home Network of UE B Network visited by UE B UE A UE B P-CSCF-A P-CSCF-B 1 4 S-CSCF-A S-CSCF-B I-CSCF-B I-CSCF-A HSS-B HSS-A User Profile 3 7 5 6 Call Control / Dialog 2 INVITE REGISTER Media Session 第 * 页 MRF控制模型 Tones and announcements ：An Application Server is in control of the tone/announcement selection and is aware of MRFC capabilities. Ad hoc conferences (multiparty calls) ：An Application Server can control an Ad Hoc conference (multiparty call) and is aware of MRFC capabilities. Transcoding ：An Application Server can control a transcoding session and is aware of MR