公开(公告)号：WO2022203662A1

公开(公告)日：2022-09-29

申请号：PCT/US2021/023829

申请日：2021-03-24

申请人： SYNIVERSE TECHNOLOGIES, LLC

发明人： YAU, Edward ,  BEACH, Brian ,  XU, Huiyue ,  DATAR, Prashant

IPC分类号： H04W8/02 ,  H04L29/06 ,  H04L29/08 ,  H04W12/08 ,  H04W36/00

摘要： This invention is a system and method for implementing a VoLTE and circuit switched voice and SMS interworking function to provide voice and SMS service to roaming mobile devices at visiting network based on VoLTE roaming and 'SMS over SGs' towards VPLMN, and circuit-switched voice and SMS towards HPLMN. The interworking function enables and redirects IMS traffic at VPLMN towards a hosted IMS core with voice connectivity to PSTN via MGCF and MGW. The interworking function also performs circuit-switched location-update registration at HLR at HPLMN for receiving mobile-terminated voice calls and SMS.