CONTENTS

1 Scope 
2 References
3 Definitions
4 Abbreviations  
5 Assumptions and partitioning    
6 Basic CAS package       
        6.1 Properties 
        6.2 Events   
        6.3 Signals   
        6.4 Statistics
        6.5 Procedures           
7 Basic CAS addressing package 
        7.1 Properties 
        7.2 Events   
        7.3 Signals   
        7.4 Statistics
        7.5 Procedures           
8 Robbed bit signalling package   
        8.1 Properties 
        8.2 Events   
        8.3 Signals   
        8.4 Statistics
        8.5 Procedures           
9 Operator services and emergency services package       
        9.1 Properties 
        9.2 Events   
        9.3 Signals   
        9.4 Statistics
        9.5 Procedures           
10 Operator services extension package    
       10.1 Properties
       10.2 Events  
       10.3 Signals  
       10.4 Statistics  
       10.5 Procedures          
Appendix I � Call flows     
        I.1 Basic single-stage MF or DTMF wink start or immediate start 
        I.2 EAOSS termination � Telephone company operator services call         
        I.3 EAOSS termination � IC/INC operator services call indirect through an access tandem (Overlap outpulsing)     
        I.4 EAOSS termination � IC/INC operator services call indirect through an access tandem (No overlap outpulsing)     
        I.5 EAOSS termination � IC/INC "National" operator direct to the IC/INC (Overlap outpulsing)     
        I.6 EAOSS termination � IC/INC "National" operator direct to the IC/INC (No overlap outpulsing)     
        I.7 EAOSS origination � Telephone operating company serves the call