CONTENTS

 1     Closed User Group (CUG)
        1.1     Definition
        1.2     Description
        1.3     Operational requirements
        1.4     Coding requirements
        1.5     Signalling requirements
        1.6     Interactions with other supplementary services
        1.7     Interaction with other networks
        1.8     Signalling flows
        1.9     Parameter value (timers)
       1.10     Dynamic description (SDLs)
 3     Multilevel precedence and preemption (MLPP)
        3.1     Definition
        3.2     Description of MLPP service
        3.3     Operational requirements
        3.4     Coding requirements
        3.5     Signalling Requirements
        3.6     Interactions with other supplementary services
        3.7     Interactions with other networks
        3.8     Signalling Flows
        3.9     Parameter Values-Timers
       3.10     Dynamic Description (SDLs)
Appendix I