ISO IEC 14843-2003 pdf – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Offer supplementary service

ISO IEC 14843-2003 pdf – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Offer supplementary service.
1 Scope This International Standard specifies the signalling protocol for the support of the Call Offer supplementary service (SS-CO) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). SS-CO is a supplementary service which, on request from the calling user (or on that user’s behalf), enables a call to be offered to a busy called user and to wait for that called user to accept this call. The Q reference point is defined in ISO/IEC 11579-1. Service specifications are produced in three stages and according to the method specified in ETS 300 387. This International Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 14841. The signalling protocol for SS-CO operates on top of the signalling protocol for basic circuit switched call control, as specified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of supplementary services specified in ISO/IEC 11582. This International Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between SS-CO and other supplementary services and ANFs. NOTE – Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage 1 specifications. This International Standard is applicable to PINXs which can interconnect to form a PISN. 2 Conformance In order to conform to this International Standard, a PINX shall satisfy the requirements identified in the Protocol Implementation Conformance Statement (PICS) proforma in annex B.
ISO/IEC 13873:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Call Diversion supplementary services ISO/IEC 14841:1996, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Specification, functional model and information flows – Call offer supplementary service ISO/IEC 14844:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Do Not Disturb and Do Not Disturb Override supplementary services ISO/IEC 14846:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Call Intrusion supplementary service ETS 300 387:1994, Private Telecommunication Network (PTN); Method for the specification of basic and supplementary services ITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs ITU-T Rec. I.210:1993, Principles of telecommunication services supported by an ISDN and the means to describe them ITU-T Rec. Q.950:2000, Supplementary services protocols, structure and general principles ITU-T Rec. Z.100:1999, Specification and description language (SDL) 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: – Application Protocol Data Unit (APDU) (ISO/IEC 11582) – Basic Service (ITU-T Rec. I.210) – Call, Basic Call (ISO/IEC 11582) – Coordination Function (ISO/IEC 11582) – Diverted-to PINX (ISO/IEC 13873) – Notification (ISO/IEC 11582) – Originating PINX (ISO/IEC 11572) – Private Integrated Services Network (PISN) (ISO/IEC 11579-1) – Private Integrated services Network eXchange (PINX) (ISO/IEC 11579-1)
4.2.2 Path retention The retaining of the network connection between the Originating PINX and the Terminating PINX so that a supplementary service (such as SS-CO) can be invoked without establishing a new connection. 4.2.3 Served User PINX The PINX serving the served user. 5 Acronyms ANF Additional Network Feature APDU Application Protocol Data Unit ASN.1 Abstract Syntax Notation no. 1 ISDN Integrated Services Digital Network NFE Network Facility Extension PICS Protocol Implementation Conformance Statement PINX Private Integrated services Network eXchange PISN Private Integrated Services Network SDL Specification and Description Language SS-CO Call Offer supplementary service 6 Signalling protocol for the support of SS-CO 6.1 SS-CO description Call Offer (SS-CO) is a supplementary service which, on request from the calling user (or on that user’s behalf), enables a call to be offered to a busy called user and to wait for that called user to accept this call. SS-CO is applicable to all circuit mode basic services defined in ISO/IEC 11574. 6.2 SS-CO operational requirements 6.2.1 Requirements on an Originating PINX Call establishment procedures for the outgoing side of an inter-PINX link and call release procedures, as specified in ISO/IEC 11572, shall apply. Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX, shall apply. 6.2.2 Requirements on a Terminating PINX Call establishment procedures for the incoming side of an inter-PINX link and call release procedures, as specified in ISO/IEC 11572, shall apply. Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for an End PINX, shall apply. 6.2.3 Requirements on a Transit PINX Basic call procedures specified in ISO/IEC 11572 for a Transit PINX shall apply. Generic procedures for the call-related control of supplementary services, as specified in ISO/IEC 11582 for a Transit PINX, shall apply.