ECMA 192 : 4ED 2001

1 Scope
2 Conformance
3 References (normative)
4 Definitions
  4.1 External definitions
  4.2 Other definitions
       4.2.1 Inter-PINX link
       4.2.2 Path retention
       4.2.3 Served User PINX
5 Acronyms
6 Signalling protocol for the support of SS-CO
  6.1 SS-CO description
  6.2 SS-CO operational requirements
       6.2.1 Requirements on an Originating PINX
       6.2.2 Requirements on a Terminating PINX
       6.2.3 Requirements on a Transit PINX
  6.3 SS-CO coding requirements
       6.3.1 Operations
       6.3.2 Notifications
       6.3.3 Information elements
       6.3.4 Messages
  6.4 SS-CO state definitions
       6.4.1 States at the Originating PINX
       6.4.2 States at the Terminating PINX
  6.5 SS-CO signalling procedures for activation, deactivation
       and registration
  6.6 SS-CO signalling procedures for invocation and operation
       6.6.1 Actions at the Originating PINX
       6.6.2 Actions at the Terminating PINX
       6.6.3 Actions at a Transit PINX
  6.7 SS-CO impact of interworking with public ISDNs
  6.8 SS-CO impact of interworking with non-ISDNs
  6.9 Protocol interactions between SS-CO and other
       supplementary services and ANFs
       6.9.1 Interaction with Calling Name Identification
              Presentation (SS-CNIP)
       6.9.2 Interaction with Connected Name Identification
              Presentation (SS-CONP)
       6.9.3 Interaction with Call Completion to Busy Subscriber
              (SS-CCBS)
       6.9.4 Interaction with Call Completion on No Reply
              (SS-CCNR)
       6.9.5 Interaction with Call Transfer (SS-CT)
       6.9.6 Interaction with Call Forwarding Unconditional
              (SS-CFU)
       6.9.7 Interaction with Call Forwarding Busy (SS-CFB)
       6.9.8 Interaction with Call Forwarding No Reply
              (SS-CFNR)
       6.9.9 Interaction with Path Replacement (ANF-PR)
       6.9.10 Interaction with Do Not Disturb (SS-DND)
       6.9.11 Interaction with Do Not Disturb Override (SS-DNDO)
       6.9.12 Interaction with Call Intrusion (SS-CI)
  6.10 SS-CO parameter values (timers)
       6.10.1 Timer T1
Annex A - Signalling protocol for the support of Path Retention
Annex B - Protocol Implementation Conformance Statement (PICS)
          proforma
Annex C - Examples of message sequences
Annex D - Specification and Description Language (SDL)
          representation of procedures
Annex E - Imported ASN.1 definitions
Annex F - ASN.1 definitions according to ITU-T Recs. X.208/X.209

Defines signalling protocol for supporting the Call Offer supplementary service (SS-CO) at the Q reference point between Private Integrated Services Network Exchanges (PINXs) connected within a Private Integrated Services Network (PISN). This is a supplementary service enabling a call to be offered to a busy called user on request from the calling user (or on that user's behalf) and to wait for that called user to accept this call.