ECMA 178 : 3ED 2001

1 Scope
2 Conformance
3 References (normative)
4 Definitions
  4.1 External definitions
  4.2 Other definitions
      4.2.1 End PINX
      4.2.2 Primary PINX
      4.2.3 Redirection number
      4.2.4 Secondary PINX
      4.2.5 Transferring PINX
5 Acronyms
6 Signalling protocol for the support of SS-CT
  6.1 SS-CT description
  6.2 SS-CT operational requirements
      6.2.1 Provision/Withdrawal
      6.2.2 Requirements on a Transferring PINX
      6.2.3 Requirements on a Primary PINX
      6.2.4 Requirements on a Secondary PINX
      6.2.5 Requirements on a Transit PINX
  6.3 SS-CT coding requirements
      6.3.1 Operations
      6.3.2 Information elements
      6.3.3 Messages
  6.4 SS-CT state definitions
      6.4.1 States at a Transferring PINX
      6.4.2 States at a Primary PINX
      6.4.3 States at a Secondary PINX
  6.5 SS-CT signalling procedures
      6.5.1 Actions at a Transferring PINX
      6.5.2 Actions at a Primary PINX
      6.5.3 Actions at a Secondary PINX
      6.5.4 Actions at a Transit PINX
      6.5.5 Subsequent actions at a Primary and a Secondary
            PINX
  6.6 SS-CT impact of interworking with public ISDNs
      6.6.1 Actions at a Gateway PINX
      6.6.2 Actions at other types of PINX
  6.7 SS-CT impact of interworking with non-ISDNs
      6.7.1 Actions at a Gateway PINX
      6.7.2 Actions at other types of PINX
  6.8 Protocol Interactions between SS-CT and other
      supplementary services and ANFs
      6.8.1 Calling Name Identification Presentation (SS-CNIP)
      6.8.2 Connected Name Identification Presentation
            (SS-CONP)
      6.8.3 Completion of Calls to Busy Subscribers (SS-CCBS)
      6.8.4 Completion of Calls on No Reply (SS-CCNR)
      6.8.5 Call Forwarding Unconditional (SS-CFU)
      6.8.6 Call Forwarding Busy (SS-CFB)
      6.8.7 Call Forwarding No Reply (SS-CFNR)
      6.8.8 Call Deflection (SS-CD)
      6.8.9 Path Replacement (ANF-PR)
  6.9 SS-CT Parameter values (Timers)
      6.9.1 Timer T1
      6.9.2 Timer T2
      6.9.3 Timer T3
      6.9.4 Timer T4
Annex A - Protocol Implementation Conformance Statement
          (PICS) proforma
Annex B - Imported ASN.1 definitions
Annex C - Examples of message sequences
Annex D - Specification and Description Language (SDL)
          representation of procedures
Annex E - Bibliography
Annex F - ASN.1 definitions according to ITU-T Recs.
          X.208/X.209

This Standard specifies the signalling protocol for the support of the Call Transfer supplementary service
(SS-CT) at the Q reference point between Private Integrated Network services eXchanges (PINXs) connected
together within a Private Integrated Services Network (PISN).