CONTENTS

 1     Scope 
        1.1     Functional reference model
 2     References 
 3     Definitions  
        3.1     Functional model definitions           
        3.2     Definition of signalling flow objects 
 4     Abbreviations   
 5     Backbone network signalling flows           
        5.1     Object reference model     
        5.2     Definitions 
        5.3     Backbone network establishment   
        5.4     Call modification flows       
        5.5     Call release
        5.6     Bearer release       
Annex A – Composite structured AAL 1 signalling flows    
        A.1     Changes to "Backward Backbone Network Establishment Composite Flow" procedures necessary to support structured AAL 1 bearers    
        A.2     Changes to the "Forward Composite" flows necessary to support structured AAL 1 bearers    
Annex B – ISUP "NNI" access establishment and release flows    
Annex C – Overview of bearer redirection    
        C.1     Bearer redirection 
        C.2     Redirection Schema          
Annex D – Overview of "Tunnelling"    
        D.1     Introduction          
        D.2     Operation of the mechanism