1     Scope 
        1.1     Explicitly out of scope        
 2     References 
 3     Definitions  
        3.1     Terms defined elsewhere    
        3.2     Term defined in this supplement      
 4     Abbreviations and acronyms        
 5     Conventions     
 6     Problem for distributed systems (such as decomposed gateways)  
        6.1     General aspects for distributed systems      
        6.2     Specific for distributed gateways (according to ITU-T H.248)        
        6.3     Functional areas with precise temporal information between ITU-T H.248 entities   
 7     Requirements    
        7.1     Time representation requirements   
        7.2     Time accuracy and precision requirements  
        7.3     Synchronization domain requirements         
        7.4     Time distribution requirements        
        7.5     Time service reliability requirements
        7.6     Local clock requirements   
        7.7     Availability requirement for accurate time after ITU-T H.248 restart or registration  
        7.8     Availability requirement for accurate time after creation of an ITU-T H.248 stream or termination     
 8     Model 
        8.1     MGC-MG model  
        8.2     Time alignment concept for a MGC-MG pair         
        8.3     ITU-T H.248 time domain model and time alignment concept         
 9     Possible solutions for clock coordination within ITU-T H.248 domains     
        9.1     Introduction           
        9.2     Time synchronization in ITU-T H.248 domains       
        9.3     Structures of time synchronization subnet    
        9.4     ITU-T H.248 Time Domain distributed over multiple time zones