5G SA EPS Fallback语音方案流程总结

2022年3月份最新版本，涵盖拨号驻网、CSFB/VOLTE语音相关的AT。 The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows:Version x.y.zThe terms GSM and GSM/UMTS are used whenever appropriate for SIM/UICC GSM applications or GSM/UMTS bearer services or to represent specif

5G SA EPS Fallback语音方案流程总结(1).docx

业务管理服务器,网管服务器，计费服务器，多媒体电话业务AS与IMS CN的接口，主叫号码显示(OIP)，被叫号码显示(TIP)，未注册呼叫前转(CFNRL)， 呼叫等待(CW)， IMS到电路域语音互通流程