ITU I.255.4:1990
ITU I.255.4:1990 Priority Service Provides for preferential treatment in the network to calls originating from and/or addressed to certain numbers in the order of path selection.
Table of Contents
1Definition2Description
2.1Generaldescription
2.2Specificterminology
2.3Qualificationsontheapplicabilityto
telecommunicationservices
3Procedures
3.1Provision/withdrawal
3.2Normalprocedures
3.3Exceptionalprocedures
3.4Alternateprocedures
4Networkcapabilitiesforcharging
5Inter-workingconsideration
6Interactionwithothersupplementaryservices
6.1CallWaiting
6.2CallTransfer
6.3ConnectedLineIdentificationPresentation
(COLP)
6.4ConnectedLineIdentificationRestriction
(COLR)
6.5CallingLineIdentificationPresentation
(CLIP)
6.6CallingLineIdentificationRestriction
(CLIR)
6.7ClosedUserGroup
6.8ConferenceCalling
6.9DirectDialling-In
6.10Diversionservices
6.11LineHunting
6.12ThreePartyService
6.13User-to-UserSignalling
6.14MultipleSubscriberNumber
6.15CallHold
6.16AdviceofCharge
6.17Multi-levelprecedenceandpreemption
service(MLPP)
6.18Priorityservice
7OverallSDLdiagram