CONTENTS

 1     Scope 
 2     References
        2.1     References
        2.2     Bibliography      
 3     Definitions    
 4     Abbreviations 
 5     Requirements 
 6     Conceptual model       
 7     Network architecture    
        7.1     E1 and IP network-based interface       
        7.2     International switching centre    
        7.3     Digital circuit multiplication equipment 
 8     Protocol   
        8.1     Information elements     
        8.2     SDL
Annex A – Signalling interface    
        A.1     Detailed protocol description