Table of Contents
1Overview
1.1Scope
1.2References
1.3Definitions
1.4Abbreviations
2Specificationmodel
3Look-Ahead,applicationprocessfunctions
3.1PrimitiveinterfaceAP/SACF
3.2Proceduresatinitiatingexchange
3.2.1Normalprocedures
3.2.2Exceptionalprocedures
3.3Procedureatanintermediatenationalexchange
3.4Procedureattheoutgoingscreeningpoint
3.5Procedureatanintermediateinternationalexchange
3.6Procedureattheincomingscreeningpoint
3.7Procedureatthedestinationlocalexchange
3.7.1Normalprocedures
3.7.2Exceptionalprocedures
4SACF
4.1InterfaceSCCP/SACF
4.1.1Primitives
4.1.2UseofSCCP
5LA-ASE
5.1InterfaceLA-ASE/SACF
5.2Supportedoperation
5.3ASEprocedures
5.3.1Dialoguebeginning
5.3.2Normaldialogueend
5.3.3Abnormaldialogueend
5.4Parameters
5.5Abstractsyntax,general
5.6ASN.1module
6TCAP
6.1InterfaceTCAP/SACF
6.1.1Primitives
6.1.2UseofTCAP
7Timers
AnnexAASN.1moduledefiningB-ISUPparameters
applicableforLA-ASE
AnnexBNetworkLookAheadIndicatorparameter
B.1NetworkLookAheadIndicatorparameter
B.2Formats
B.3Procedures
AppendixIB-ISUPParametersusedintheLook-AheadProcedure
AppendixIIGuidelinesontheuseofLook-Aheadwithout
statechange
II.1Criteriaforinvocation
II.1.1High-resourceconnections
II.1.2Numberanalysis
II.1.3Serviceindications
II.1.4Callingpartyindications
II.2CriteriaforprecludinguseofLook-Ahead
II.3ManagementofLook-Aheadcriteria
II.4RelationshipbetweenLook-Aheadand
Multipartyservice
AppendixIIILook-AheadmessageflowfortheUNI/NNI
Interworking
III.1Firstscenario
III.2Secondscenario
III.3Thirdscenario
III.4Fourthscenario
III.5Fifthscenario
AppendixIVPrimitiverelationships
AppendixVLook-AheadrelationshipsinvolvingMultiple
Networks
AppendixVICodingofinstructionindicatorsfortheNetwork
LookAheadIndicator Abstract
Defines methods for Look-Ahead without state change at the B-ISDN Network Node interface. Defines the essential features, methods and operations necessary for Look-Ahead. This facility permits a network to perform called-terminal availability and compatibility checking without committing of network resources.
