ISO IEC 15992 pdf download – 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 pdf download – 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
1Scope
This International Standard specifies the sign alling protocol for the support of the Call Priority Ilnterruption (SS-CPI) and CallPriority Interruption Protection (Ss-CPIP) supplementary services at the Q reference point between Private Integrated servicesNetwork eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN).
NOTE 1 -This edition of this lnternational 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 channelavailable. 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/EC 11579-1.
Service specifications are produced in three stages and according to the method specified in ETS 300 387.This InternationalStandard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 andstage 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, asspecified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of supplementary servicesspecified in ISO/IEC 11582.
This International Standard also specifies additional signalling protocol requirements for the support of interactions at the Qreference point between SS-CPI(P) and other supplementary services and ANFs.
NOTE2 – Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage lspecifications.
This International Standard is applicable to PINXs that can interconnect to form a PISN.2Conformance
ln order to conform to this International Standard, a PINX shall satisfy the requirements identified in the ProtocolImplementation Conformance Statement (PICS) proforma in annex A.
Conformance to this Intermational Standard includes conforming to those clauses that specify protocol interactions betweensS-CPI(P) and other supplementary services and ANFs for which signalling protocols at the Q reference point are supported inaccordance with the stage 3 standards concerned.
3Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only theedition cited applies.For undated references，the latest edition of the referenced document (including any amendments)applies.
ISOIEC 11572:2000, Information technology – Telecommunications and information exchange between systems – PrivateIntegrated Services Network – Circuit mode bearer services – Inter-exchange signalling procedures and protocol
ISOIEC11574:2000, Information technology – Telecommunications and information exchange between systems – PrivateIntegrated Services Network – Circuit-mode 64 kbit/s bearer services – Service description, functional capabilities andinformation flows
ISOIEC 11579-1:1994,Information technology – Telecommunications and information exchange between systems – Privateintegrated services network – Part l : Reference configuration for PISN Exchanges (PINX)
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:
− Adjacent PINX
(ISO/IEC 11582)
− 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)
− Notification
(ISO/IEC 11582)
− Originating PINX (ISO/IEC 11572)
− Preceding PINX
(ISO/IEC 11572)
− Private Integrated Services Network (PISN) (ISO/IEC 11579-1)
− Private Integrated services Network Exchange (PINX)
(ISO/IEC 11579-1)
− Signalling (ITU-T Rec. I.112)
− Subsequent PINX
(ISO/IEC 11572)
− Supplementary Service
(ITU-T Rec. I.210)
− Terminating PINX
(ISO/IEC 11572)
− Transit PINX
(ISO/IEC 11572)
− User
(ISO/IEC 11574)
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.