CONTENTS

 1     Definition
 2     Description
        2.1     General description
        2.2     Specific terminology
        2.3     Qualification of the applicability to telecommunication services
 3     Procedures
        3.1     Provision/withdrawal
        3.2     Normal procedures
        3.3     Exceptional procedures
        3.4     Alternative procedures
 4     Network capabilities for charging
 5     Interworking requirements
 6     Interaction with other supplementary services
        6.1     Advice Of Charge services
        6.2     Call Hold (HOLD)
        6.3     Call transfer services
        6.4     Call Waiting (CW)
        6.5     Closed User Group (CUG)
        6.6     Completion of calls services
        6.7     Conference services
        6.8     Diversion services
        6.9     Direct-Dialling-In (DDI)
       6.10     In-call-Modification (IM)
       6.11     ISDN freephone Service (IFS)
       6.12     Line Hunting (LH)
       6.13     Malicious Call Identification (MCID)
       6.14     Multi-Level Precedence and Preemption (MLPP)
       6.15     Multiple Subscriber Number (MSN)
       6.16     Name identification services
       6.17     Number identification services
       6.18     Outgoing Call Barring (OCB)
       6.19     Reverse Charging (REV)
       6.20     Sub-addressing (SUB)
       6.21     Support of Private Numbering Plans (SPNP)
       6.22     Terminal Portability (TP)
       6.23     User-to-User signalling
 7     Dynamic description
Annex  A  –  Interaction between User-to-User Signalling and call diversion services