PD 6625:2000

0 PREFACE
      0.1 Title
      0.2 Normative Information
      0.3 Contents
      0.4 History
      0.5 Issue Control
      0.6 References
      0.7 Glossary of terms
      0.8 Scope
             0.8.1 Document Structure
             0.8.2 Scope of Service Description
             0.8.3 Scope of Functional Description
1 SERVICE DESCRIPTION
      1.1 General
      1.2 Activation
      1.3 Deactivation
      1.4 Invocation and Operation
      1.5 Exceptional Procedures - Activation
      1.6 Exceptional Procedures - Deactivation
      1.7 Exceptional Procedures - Invocation and Operation
             1.7.1 User B becomes busy during the period
                      before user A is offered a CCBS recall
             1.7.2 User A is busy or CCBS busy when user B
                      becomes not busy
             1.7.3 User B is busy when the CCBS call is
                      offered to user B
      1.8 Interaction with other Services
             1.8.1 Display Calling Number Services
             1.8.2 Number Portability
             1.8.3 Translated Number Services
             1.8.4 Diversion Type Services
             1.8.5 Multiple Subscriber Number
             1.8.6 Telemetry
             1.8.7 Malicious Call Identification Services
             1.8.8 Operator and Administration Services
             1.8.9 Emergency Services
             1.8.10 UK Barring Services
2 FUNCTIONAL DESCRIPTION
      2.1 General
      2.2 Activation
      2.3 Deactivation
      2.4 Invocation and Operation
      2.5 Exceptional Procedures - Activation
      2.6 Exceptional Procedures - Deactivation
             2.6.1 Originating network
             2.6.2 Terminating network
      2.7 Exceptional Procedures - Invocation and Operation
             2.7.1 User B becomes busy during the B idle
                      guard time
             2.7.2 User A is busy when destination B
                      becomes not busy
             2.7.3 User B is busy when the CCBS Call is
                      established
             2.7.4 User B receiver unexpected CCBS call
      2.8 Interaction with other Supplementary Services
             2.8.1 Display Calling Number Services
             2.8.2 Number Portability
             2.8.3 Translated Number Services
             2.8.4 Diversion Type Services
             2.8.5 Multiple Subscriber Number
             2.8.6 Telemetry
             2.8.7 Malicious Call Identification Services
             2.8.8 Operator and Administration Services
             2.8.9 Emergency Services
             2.8.10 UK Barring Services

Divided into two sections: 1) A service description of CCBS for operation in the UK and has its own revision history. Equivalent to an ETSI stage 1 description. 2) A functional description of the CCBS service for interconnect signalling and has its own revision history. Section two is equivalent to an ETSI stage 2 description. The functional and service description are in the same document for convenience. The resultant interface/protocol specifications for CCBS can be found in the relevant sections of ISC documents covering UK ISUP and IUP. Stage 2 description of RBWF is contained in INFO/004 section 5.