BS ISO/IEC 15055:1997

Foreword
Introduction
1 Scope
2 Conformance
3 Normative references
4 Definitions
    4.1 External definitions
    4.2 Other definitions
5 List of acronyms
6 ANF-TC stage 1 specification
    6.1 Description
          6.1.1 General description
          6.1.2 Qualifications on applicability to
                  telecommunication services
    6.2 Procedure
          6.2.1 Provision/withdrawal
          6.2.2 Normal procedures
          6.2.3 Exceptional procedures
    6.3 Interaction with other supplementary services
          and ANFs
          6.3.1 Calling Line Identification Presentation
                  (SS-CLIP)
          6.3.2 Connected Line Identification Presentation
                  (COLP)
          6.3.3 Calling/Connected Line Identification
                  Restriction (SS-CLIR)
          6.3.4 Calling Name Identification Presentation
                  (SS-CNIP)
          6.3.5 Connected Name Identification Presentation
                  (SS-CONP)
          6.3.6 Calling/Connected Name Identification
                  Presentation Restriction (SS-CNIR)
          6.3.7 Completion of Calls to Busy Subscriber
                  (SS-CCBS)
          6.3.8 Completion of Calls on No Reply (SS-CCNR)
          6.3.9 Call Transfer (SS-CT)
          6.3.10 Call Forwarding Unconditional (SS-CFU)
          6.3.11 Call Forwarding Busy (SS-CFB)
          6.3.12 Call Forwarding No Reply (SS-CFNR)
          6.3.13 Call Deflection (SS-CD)
          6.3.14 Path Replacement (ANF-PR)
          6.3.15 Call interception (ANF-CINT)
          6.3.16 Advice of Charge (SS-AOC)
          6.3.17 Recall (SS-RE)
          6.3.18 Call Offer (SS-CO)
          6.3.19 Call Intrusion (SS-CI)
          6.3.20 Do Not Disturb (SS-DND)
          6.3.21 Do Not Disturb Override (SS-DNDO)
    6.4 Interworking considerations
    6.5 Overall SDL
7 ANF-TC stage 2 specifications
    7.1 Functional model
          7.1.1 Functional model description
          7.1.2 Description of functional entities
          7.1.3 Relationship of functional model to basic
                  call functional model
    7.2 Information flows
          7.2.1 Definition of information flows
          7.2.2 Relationship of information flows to
                  basic call information flows
          7.2.3 Examples of information flow sequences
    7.3 Functional entity actions
          7.3.1 Functional entity actions of FE1
          7.3.2 Functional entity actions of FE2
    7.4 Functional entity behaviour
          7.4.1 Behaviour of FE1
          7.4.2 Behaviour of FE2
    7.5 Allocation of functional entities of physical
          equipment
    7.6 Interworking considerations

Defines the Transit Counter additional network feature for applying to various basic services supported by Private Intergrated Services Networks (PISN). This is an additional network feature limiting the number of network exchanges transitted by a call requrest during call establishment, such as for protection of the network from indefinite looping. No user is involved in providing or operating ANF-TC.