CONTENTS

 3     Reverse Charging (REV)
        3.1     Scope
        3.2     References
        3.3     Definitions
        3.4     Symbols and abbreviations
        3.5     Description
        3.6     Derivation of the functional model
        3.7     Information flows
        3.8     SDL diagrams for functional entities
        3.9     Functional entity actions (FEAs)
       3.10     Allocation of functional entities to physical locations
Apendix I – Interworking requirement
        I.1     Interworking of Reverse Charging with PSTN