| Number | Title | 
                                
                                    
                                        | 22.101 | Service aspects; Service principles | 
                                
                                    
                                        | 23.002 | Network architecture | 
                                
                                    
                                        | 23.003 | Numbering, addressing and identification | 
                                
                                    
                                        | 23.009 | Handover procedures | 
                                
                                    
                                        | 23.060 | General Packet Radio Service (GPRS); Service description; Stage 2 | 
                                
                                    
                                        | 23.167 | IP Multimedia Subsystem (IMS) emergency sessions | 
                                
                                    
                                        | 23.203 | Policy and charging control architecture | 
                                
                                    
                                        | 23.206 | Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 2 | 
                                
                                    
                                        | 23.216 | Single Radio Voice Call Continuity (SRVCC); Stage 2 | 
                                
                                    
                                        | 23.221 | Architectural requirements | 
                                
                                    
                                        | 23.228 | IP Multimedia Subsystem (IMS); Stage 2 | 
                                
                                    
                                        | 23.237 | IP Multimedia Subsystem (IMS) Service Continuity; Stage 2 | 
                                
                                    
                                        | 24.007 | Mobile radio interface signalling layer 3; General Aspects | 
                                
                                    
                                        | 24.008 | Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 | 
                                
                                    
                                        | 24.167 | 3GPP IMS Management Object (MO); Stage 3 | 
                                
                                    
                                        | 24.206 | Voice call continuity between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 3 | 
                                
                                    
                                        | 24.216 | Communication Continuity Management Object (MO) | 
                                
                                    
                                        | 24.229 | IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 | 
                                
                                    
                                        | 24.237 | IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 | 
                                
                                    
                                        | 24.292 | IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Stage 3 | 
                                
                                    
                                        | 24.301 | Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 | 
                                
                                    
                                        | 29.163 | Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks | 
                                
                                    
                                        | 29.272 | Evolved Packet System (EPS); Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) related interfaces based on Diameter protocol | 
                                
                                    
                                        | 29.280 | Evolved Packet System (EPS); 3GPP Sv interface (MME to MSC, and SGSN to MSC) for SRVCC | 
                                
                                    
                                        | 29.328 | IP Multimedia (IM) Subsystem Sh interface; Signalling flows and message contents | 
                                
                                    
                                        | 32.250 | Telecommunication management; Charging management; Circuit Switched (CS) domain charging | 
                                
                                    
                                        | 32.260 | Telecommunication management;Charging management;IP Multimedia Subsystem (IMS) charging | 
                                
                                    
                                        | 32.298 | Telecommunication management; Charging management; Charging Data Record (CDR) parameter description | 
                                
                                    
                                        | 32.299 | Telecommunication management; Charging management; Diameter charging applications |