1、INTERNATIONAL STANDARD ISO/IEC 14842 First edition 1996-09-I 5 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Do not disturb and do not disturb override supplementary
2、 services Technologies de /information - T that is, to allow the call to proceed as if the called user had not activated SS-DND. SS-DND and SS-DNDO are described separately because SS-DND is a service used by a called user, and SS-DNDO is a service used by a calling user. This leads to describing tw
3、o very related state machines. Note 1 - It is possible to implement SS-DND without implementing SS-DNDO. Supplementary service specifications are produced in three stages, according to the method described in CCIIT Recommendation 1.130. This International Standard contains the stage 1 and stage 2 sp
4、ecifications of SS-DND and SS-DNDO. The stage 1 specifications (clauses 6 and 7) specify the supplementary service as seen by users of PISNs. The stage 2 specification (clauses 8 and 9) identify the functional entities involved in the supplementary service and the information flows between them. 2 C
5、onformance In order to conform to this International Standard, a stage 3 International Standard shall specify signalling protocols and equipment behaviour that are capable of being used in a PISN which supports the supplementary service specified in this International Standard. This means that, to c
6、laim conformance, a stage 3 International Standard is required to be adequate for the support of those aspects of clauses 6 to 9 which are relevant to the interface or equipment to which the stage 3 International Standard applies. The stage 1 and stage 2 clauses which a stage 3 International Standar
7、d for the Do Not Disturb supplementary service is required to support are clauses 6 and 8. The stage 1 and stage 2 clauses which a stage 3 International Standard for the Do Not Disturb Override supplementary service is required to support are clauses 7 and 9. 3 Normative references The following sta
8、ndards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged t
9、o investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. 1 ISO/IEC 14842:1996 (E) OISO/IEC ISO/IEC 13863:1995, ISO/IEC 13864:1995, ISO/IEC 13865: 1995, ISO/IEC 13866:1995
10、, ISO/IEC 13872:1995, ISO/IEC 14136: 1995, ISOiIEC 14841: 1996, CCIlT Rec. I.1 12:1988, CCITI Rec. 1.210:1988, CCITI Rec. Z. 100: 1988, 4 Definitions Information technology - Telecommunications and information exchange between systems - Private integrated Services Network - Specification, functional
11、 model and information flows - Path replacement additional network feature. Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Name identification supplementary services.
12、 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Call transfer supplementary service. Information technology - Telecommunications and information exchange between syst
13、ems - Private Integrated Services Network - Specification, functional model and information flows - Call completion supplementary services. Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and
14、 information flows - Call diversion supplementary services. Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Identification supplementary services. Information technolo
15、gy - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Call offer supplementary service. Vocabulary of terms for ISDNs (Blue Book). Principles of telecommunication services supported by an ISDN
16、and the means to describe them (Blue Book). Specification and Description Language (Blue Book). For the purposes of this International Standard, the following definitions apply. 4.1 External definitions This International Standard uses the following terms defined in other documents: - Basic service
17、(CCITT Rec. 1.210) - Calling Party Name (ISO/IEC 13864) - Connection (CCIIT Rec. I. 112) - Name (ISO/IEC 13864) - Number (ISOAEC 1157 1) - Private Integrated Services Network (PISN) (ISO/IEC 11579-l) - Private Integrated Services Network Exchange (PINX) (ISO/IEC 11579-l) - Service (CCIIT Rec. I. 112
18、) - Signalling (CCITT Rec. I.1 12) - Subaddress (ISO/IEC 1157 1) - Supplementary Service (CCITT Rec. 1.210) - User (ISOAEC 11574) This International Standard refers to the following basic call functional entity (FEs) defined in ISO/IEC 11574: - Call Control (CC) 2 OISO/IEC ISO/IEC 14842: 1996 (E) -
19、Call Control Agent (CCA) This International Standard refers to the following basic call inter-FE relationships defined in ISOAEC 11574: - rl - r2 - r3 This International Standard refers to the following basic call information flows defined in ISO/IEC 11574: - CHAN ACK request/indication - Disconnect
20、 request/indication - Release request/indication - Release response/confirmation - Report request/indication - Setup request/indication - Setup response/confirmation. This International Standard refers to the following basic call information flow service elements defined in ISO/IEC 11574: - Destinat
21、ion Number - Connection type. This International Standard refers to the following information flow elements defined in ISO/IEC 14136: - Originating number - Originating subaddress. 4.2 Other definitions additional network feature : A capability, over and above that of a basic service, provided by a
22、PISN, but not directly to a PISN user. call, basic call : An instance of the use of a basic service. consultation timer : A timer governing the time in which the calling user is allowed to request invocation of SS-DNDO after being informed that a call has failed because of SS-DND active at the desti
23、nation. The duration of the timer is an implementation option. originating number : The number of the calling user. originating subaddress : The subaddress of the calling user. path retention : The retention of the network connection between the Originating CC and the Destination CC so that a supple
24、mentary service (such as SS-DNDO) can be invoked without establishing a new connection. served user : The user for which SS-DND is activated or deactivated, or for which SS-DND is invoked. 5 List of acronyms Additional Network Feature cc CCA CCBS CCNR CD CFB Call Control (functional entity) Call Control Agent (functional entity) Call Completion to Busy Subscriber Call Completion on No Reply Call Deflection Call Forwarding Busy
