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