CONTENTS

1     Scope        
 2     References             
 3     Definitions
        3.1     Terms defined elsewhere      
        3.2     Terms defined in this Recommendation          
 4     Abbreviations and acronyms           
 5     CRBT service and architecture        
        5.1     General description  
        5.2     General architecture
        5.3     Possible CRBT service architectures   
 6     Service models      
 7     Media formats       
        7.1     Audio            
        7.2     Video            
        7.3     Text 
        7.4     Still image    
 8     Signalling requirements     
        8.1     Requirements for the originating UE  
        8.2     Requirements for the originating P-CSC-FE     
        8.3     Requirements for the I-CSC-FE           
        8.4     Requirements for the S-CSC-FE           
        8.5     Requirements for the IBC-FE 
        8.6     Requirements for the AMG-FE            
        8.7     Requirements for the call server        
        8.8     Requirements for the AS-FE   
        8.9     Requirements for the MRC-FE            
       8.10     Requirements for the terminating P-CSC-FE  
       8.11     Requirements for the terminating UE            
 9     Protocol profiles    
        9.1     IMS-based CRBT service        
        9.2     Call server-based CRBT service          
10     Interactions between networks      
       10.1     Providing circuit-switched network CRBT to the originating UE in the IMS domain        
       10.2     Providing IMS CRBT to the originating UE in circuit switched network 
11     Interactions with other services on NGN     
       11.1     Originating identification presentation (OIP) 
       11.2     Originating identification restriction (OIR)     
       11.3     Terminating identification presentation (TIP)
       11.4     Terminating identification restriction (TIR)    
       11.5     Communication HOLD (HOLD)          
       11.6 Communication DIVersion (CDIV) services     
       11.7 Explicit communication transfer (ECT) service            
       11.8     Originating CRBT service interacting with terminating CRBT service   
       11.9     Terminating early media services to calling party other than CRBT     
12     Security considerations      
Annex A – Multi-dialog model    
        A.1     General description  
        A.2     Signalling requirements        
Appendix I – Signalling flows    
        I.1               IMS-based CRBT service by gateway model with PRACK and UPDATE (Originating IMS-UE case)    
        I.2               IMS-based CRBT service by gateway model with re-INVITE (Originating IMS-UE case)    
        I.3               CRBT service by application server model           
        I.4               CRBT service by HTTP model (Originating IMS-UE case)  
        I.5               CRBT service by gateway model (Originating PSTN/ISDN interworking case)         
        I.6               CRBT service by gateway model (Originating POTS-UE case)        
        I.7               Call server-based CRBT service by gateway model (Originating IMS-UE case)       
        I.8               Originating CRBT service interacts with terminating CRBT service by AS model    
        I.9               Providing circuit switched network CRBT to the originating UE in IMS domain       
       I.10     Providing IMS CRBT to the originating UE in circuit switched network domain  
Bibliography