ISO IEC 15992-2003 pdf – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Priority Interruption and Call Priority Interruption Protection supplementary services

ISO IEC 15992-2003 pdf – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Priority Interruption and Call Priority Interruption Protection supplementary services.
1 Scope This International Standard specifies the signalling protocol for the support of the Call Priority Interruption (SS-CPI) and Call Priority Interruption Protection (SS-CPIP) supplementary services at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). NOTE 1 – This edition of this International Standard does not apply to calls using the circuit-mode multiple rate bearer service. SS-CPI allows a call request for a priority call to proceed successfully in the case that there is no user information channel available. This is accomplished by force releasing an established call of lower priority. SS-CPIP allows for the protection of calls against interruption from priority calls. 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 15991. The signalling protocol for SS-CPI(P) 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-CPI(P) and other supplementary services and ANFs. NOTE 2 – 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 that can interconnect to form a PISN.
ISO/IEC 11582:2002, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Generic functional protocol for the support of supplementary services – Inter-exchange signalling procedures and protocol ISO/IEC 13869:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Call Transfer supplementary service 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 13874:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Path Replacement additional network feature ISO/IEC 15054:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Call Interception additional network feature ISO/IEC 15431:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Inter-exchange signalling protocol – Wireless terminal call handling additional network features ISO/IEC 15991:2003, Information technology – Telecommunications and information exchange between systems – Private Integrated Services Network – Specification, functional model and information flows – Call Priority Interruption and Call Priority Interruption Protection supplementary services 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.
4.2 Called user The user that receives a request to accept an incoming call and who may request SS-CPIP. 4.3 Calling user The user that originates a call attempt and who may request SS-CPI and/or SS-CPIP. 4.4 Call interruption An invocation procedure of SS-CPI whereby the calling user indicates that a “priority call” is to be made. 4.5 Call Priority Interruption Capability Level (CPICL) A parameter indicating the priority of a call. 4.6 Call Priority Interruption Protection Level (CPIPL) A parameter indicating a level of protection of a call against interruption from other calls. 4.7 Call protection An invocation procedure of SS-CPIP whereby the calling user or the called user indicates that a call is to be protected. 4.8 Established call The active call that is selected for interruption. 4.9 Established call user A user in the established call. 4.10 Established call user’s PINX The PINX serving one of the users in the established call. 4.11 Forced release The release of the established call during interruption. 4.12 Inter-PINX link The totality of a signalling channel and a number of user information channels at the Q reference point. 4.13 Interrupting PINX The PINX that selects an established call for interruption. NOTE 3 – The Originating PINX or any Transit PINX involved in a call may also be an Interrupting PINX. 4.14 Non-priority call A call that has not been assigned a CPICL value. 4.15 Priority call A call that has a CPICL value greater than zero. NOTE 4 – A priority call may also be a protected call. 4.16 Protected call A call that has a CPIPL value greater than zero. NOTE 5 – A protected call may also be a priority call.