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
This lnternational Standard specifies the signalling protocol for the support of the Call Priority Interruption (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 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 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 300387.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/IEC11582.
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 1specifications.
This International Standard is applicable to PINXs that can interconnect to form a PISN.
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 International 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.
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
ISO/IEC 11574:2000,Information technology – Telecommunications and information exchange between systems – PrivateIntegrated Services Network – Circuit-mode 64 kbits 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)