IMS Conference Call Flow - EventHelix.com

IMS Conference (IMS Conference Call)Calling UE IMS Network Called UECaller UserEquipmentIMS 1 IMS 1 MRF IMS 2 Called UserEquipmentConferenceInitiatorInitiatingP-CSCFInitiatingS-CSCFMRFC-AS MRFP ParticipatingI-CSCFParticipatingS-CSCFParticipatingP-CSCFConferenceParticipantEventStudio System Designer 4.018-May-08 10:40 (Page 4)200 OK (NOTIFY) 200 OK (NOTIFY) 200 OK (NOTIFY) 200 OK (NOTIFY) 200 OK (NOTIFY) The "200 OK" Acknowledges theNOTIFY message.Called Conference Participant enters ConferenceINVITE100 TryingINVITETo: conf-factory1@mrfc1.home1.netSIP/2.0,From: ,SDP: 100 TryingCalled Conference UE is aware of aconference-factory URI from REFER.INVITE100 TryingThe S-CSCF forwards the INVITErequest to the MRFC-AS that isindicated in the message.H.248 interaction to create conference connectionresources for called conference participant UE.183 Session Prog 183 Session Prog 183 Session Prog 183 Session ProgAllocate resources for negotiated codecPRACKPRACKPRACKH.248 interaction to modify conference connectionresources for Called Conference Participant UEbeginResource reservation forconference session200 OK (PRACK) 200 OK (PRACK) 200 OK (PRACK)UPDATEUPDATEendResource reservation forconference sessionUPDATEH.248 interaction to through connect conferenceconnection resources for Called Conference Participant200 OK (UPDATE) 200 OK (UPDATE) 200 OK (UPDATE)200 OK (INVITE) 200 OK (INVITE) 200 OK (INVITE)