Foreword1 Scope2 References3 Definitions, symbols and abbreviations4 Conferencing overview5 Protocol using SIP and SIP events for conferencing6 Protocol using SDP for conferencing7 Void.8 Protocol for floor control for conferencingA.1 Scope of signalling flowsA.2 IntroductionA.3 Flows demonstrating the creation of a conferenceA.4 Flows demonstrating a user joining a conferenceA.4.1 IntroductionA.4.2 User calling into a conferenceA.4.3 User getting invited to a conferenceA.4.4 User requesting IMS to join another userA.4.5 User joins a private conversation to a conferenceA.5 Flows demonstrating a user subscribing to the conference event packageA.6 Flows demonstrating a user leaving a conferenceA.7 Flows demonstrating conference terminationA.8 Flows demonstrating usage of hold and resume during conferencesA.9 Flows demonstrating the use of the Replaces header A.4.1 Introduction 24.1473GPPConferencing using the IP Multimedia (IM) Core Network (CN) subsystemRelease 17Stage 3TS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM Void