1、 Standard ECMA-174 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Diversion Supplementary Services Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Intern
2、et: helpdeskecma.ch . Standard ECMA-174 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Diversion Supplementary Services (QSIG-CF) Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 -
3、URL: http:/www.ecma.ch - Internet: helpdeskecma.ch IW Ecma-174.doc 14-01-02 09,30 . Brief History This Standard is one of a series of ECMA Standards defining services and signalling protocols applicable to Private Integrated Services Networks (PISNs). The series uses ISDN concepts as developed by IT
4、U-T and conforms to the framework of International Standards for Open Systems Interconnection as defined by ISO/IEC. This particular Standard specifies the signalling protocol for use at the Q reference point in support of the Call Diversion supplementary services: Call Forwarding Unconditional (SS-
5、CFU) Call Forwarding Busy (SS-CFB) Call Forwarding No Reply (SS-CFNR) Call Deflection (SS-CD) The protocol defined in this Standard forms part of the PSS1 protocol (informally known as QSIG). This Standard is based upon the practical experience of ECMA member companies and the results of their activ
6、e and continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardization bodies. It represents a pragmatic and widely based consensus. Compared to the 1st Edition of Standard ECMA-174 (published by ECMA in June 1992), the 2nd Edition was extended t
7、o include the Call Deflection supplementary service (SS-CD) and changes were incorporated in order to achieve alignment with International Standard ISO/IEC 13873:1995(E) published by ISO/IEC in December 1995. Compared to the 2nd Edition of Standard ECMA-174 (published by ECMA in June 1997), this 3rd
8、 Edition incorporates editorial errata and removes all differences with International Standard ISO/IEC 13873:1995. The 3rdedition also incorporates migration to ASN.1 version 1997 and clarifies normative text to explicitly align SS-CFNR forward switching procedures with SS-CFNR re-route procedures.
9、Adopted as 3rd Edition of Standard ECMA-174 by the General Assembly of December 2001. - i - Table of contents 1 Scope 1 2 Conformance 1 3 References (normative) 1 4 Definitions 2 4.1 External definitions 2 4.2 Other definitions 3 4.2.1 Activating PINX 3 4.2.2 Busy 3 4.2.3 Connected number 3 4.2.4 De
10、activating PINX 3 4.2.5 Diversion 3 4.2.6 Diverted-to number 3 4.2.7 Diverted-to PINX 3 4.2.8 Diverted-to user 3 4.2.9 Diverting cause 3 4.2.10 Diverting number 3 4.2.11 Forwarding 3 4.2.12 Forward switching 3 4.2.13 Interrogating PINX 3 4.2.14 Last diverting user 3 4.2.15 Original called number 3 4
11、.2.16 Original called user 3 4.2.17 Partial rerouteing 4 4.2.18 Presentation indicator 4 4.2.19 Rerouteing 4 4.2.20 Rerouteing PINX 4 4.2.21 Served user 4 4.2.22 User A 4 4.2.23 User B 4 4.2.24 User B1, user B2, user B3, etc. 4 4.2.25 User C 4 5 Acronyms 4 6 Signalling protocol for the support of SS
12、-DIV 5 6.1 SS-DIV description 5 6.2 SS-DIV operational requirements 5 6.2.1 Provision/withdrawal 5 6.2.2 Requirements on the Originating PINX 6 6.2.3 Requirements on the Served User PINX 6 - ii - 6.2.4 Requirements on the Diverted-to PINX 6 6.2.5 Requirements on the Rerouteing PINX 6 6.2.6 Requireme
13、nts on a Transit PINX 6 6.2.7 Requirements on the Activating PINX 7 6.2.8 Requirements on the Deactivating PINX 7 6.2.9 Requirements on the Interrogating PINX 7 6.3 SS-DIV coding requirements 7 6.3.1 Operations 7 6.3.2 Information elements 14 6.3.3 Messages 14 6.4 SS-DIV state definitions 14 6.4.1 S
14、tates at the Originating PINX 14 6.4.2 States at the Served User PINX 14 6.4.3 States at the Diverted-to PINX 15 6.4.4 States at the Rerouteing PINX 15 6.4.5 States at the Activating PINX 15 6.4.6 States at the Deactivating PINX 15 6.4.7 States at the Interrogating PINX 15 6.5 SS-DIV Signalling proc
15、edures 16 6.5.1 Actions at the Originating PINX 16 6.5.2 Actions at a Transit PINX 17 6.5.3 Actions at the Served User PINX 17 6.5.4 Actions at the Rerouteing PINX 20 6.5.5 Actions at the Diverted-to PINX 22 6.5.6 Actions at the Activating PINX 22 6.5.7 Actions at the Deactivating PINX 23 6.5.8 Acti
16、ons at the Interrogating PINX 23 6.6 SS-DIV Impact of interworking with public ISDNs 24 6.6.1 Impact of interworking on incoming calls 24 6.6.2 Impact of interworking on outgoing calls 25 6.7 SS-DIV Impact of interworking with non-ISDNs 25 6.7.1 Impact of interworking on incoming calls 25 6.7.2 Impa
17、ct of interworking on outgoing calls 25 6.8 Protocol interactions between SS-DIV and other SSs and ANFs 25 6.8.1 Protocol interactions of Call Forwarding Unconditional (SS-CFU) 26 6.8.2 Protocol interactions of Call Forwarding Busy (SS-CFB) 28 6.8.3 Protocol interactions of Call Forwarding No Reply
18、(SS-CFNR) 29 6.8.4 Protocol interactions of Call Deflection (SS-CD) 30 6.9 SS-DIV parameter values (timers) 30 6.9.1 Timer T1 30 6.9.2 Timer T2 31 6.9.3 Timer T3 31 6.9.4 Timer T4 31 6.9.5 Timer T5 31 Annex A - Protocol Implementation Conformance Statement (PICS) proforma 33 - iii - Annex B - Import
19、ed ASN.1 definitions 45 Annex C - Specification and Description Language (SDL) representation of procedures 47 Annex D - Examples of message sequences 61 Annex E - Bibliography 73 Annex F - ASN.1 definitions according to ITU-T Recs. X.208 / X.209 75 1 Scope This Standard specifies the signalling pro
20、tocol for the support of Call Diversion supplementary services (SS-DIV) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). The Call Diversion supplementary services are Call Forwarding Uncondi
21、tional (SS-CFU), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection (SS-CD). SS-CFU, SS-CFB, SS-CFNR and SS-CD are supplementary services which permit a served user to have the PISN send all or specific incoming calls addressed to the served users PISN number to an
22、other number. The Q reference point is defined in ECMA-133. Service specifications are produced in three stages and according to the method specified in ETS 300 387. This Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 an
23、d stage 2 specifications in ECMA-173. The signalling protocol for SS-DIV operates on top of the signalling protocol for basic circuit switched call control, as specified in ECMA-143 and uses certain aspects of the generic procedures for the control of supplementary services specified in ECMA-165. Th
24、is Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between SS-DIV and other supplementary services and ANFs. This Standard is applicable to PINXs which can be interconnected to form a PISN. 2 Conformance In order to conform
25、 to this Standard, a PINX shall satisfy the requirements identified in the Protocol Implementation Conformance Statement (PICS) proforma in annex A. 3 References (normative) The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. All
26、standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. In the case of references to ECMA Standards that are aligned with ISO/IEC International Standards,
27、the number of the appropriate ISO/IEC International Standard is given in brackets after the ECMA reference. ECMA-133 Private Integrated Services Network (PISN) - Reference Configuration for PISN Exchanges (PINX) (International Standard ISO/IEC 11579-1) ECMA-142 Private Integrated Services Network (P
28、ISN) - Circuit-mode 64 kbit/s Bearer Services - Service Description, Functional Capabilities and Information Flows (International Standard ISO/IEC 11574) ECMA-143 Private Integrated Services Network (PISN) - Circuit-mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (Internatio
29、nal Standard ISO/IEC 11572) ECMA-164 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Name Identification Supplementary Services (International Standard ISO/IEC 13868) ECMA-165 Private Integrated Services Network (PISN) - Generic Functional Protocol for the Support o
30、f Supplementary Services - Inter-Exchange Signalling Procedures and Protocol (International Standard ISO/IEC 11582) ECMA-173 Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Call Diversion Supplementary Services (International Standard ISO/IEC 1387
31、2) ECMA-178 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Services (International Standard ISO/IEC 13869) - 2 - ECMA-186 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Completion Supplementary Ser
32、vices (International Standard ISO/IEC 13870) ETS 300 387 Private Telecommunication Network (PTN); Method for the specification of basic and supplementary services (1994) ITU-T Rec. I.112 Vocabulary of terms for ISDNs (1993) ITU-T Rec. I.210 Principles of telecommunication services supported by an IS
33、DN and the means to describe them (1993) ITU-T Rec. I.221 Common specific characteristics of services (1993) ITU-T Rec. Q.950 Supplementary services protocols, structure and general principles (2000) ITU-T Rec. Q.952 Stage 3 service description for call offering supplementary services using DSS 1 -
34、Diversion supplementary services (1993) ITU-T Rec. Z.100 Specification and description language (1999) 4 Definitions For the purposes of this Standard, the following definitions apply. 4.1 External definitions This Standard uses the following terms defined in other documents: Application Protocol Da
35、ta Unit (APDU) (ECMA-165) Basic Service (ITU-T Rec. I.210) Call, Basic Call (ECMA-165) Coordination Function (ECMA-165) End PINX (ECMA-143) Incoming Gateway PINX (ECMA-143) Interpretation APDU (ECMA-165) Network determined user busy (ITU-T Rec. I.221) Notification (ECMA-165) Originating PINX (ECMA-1
36、43) Outgoing Gateway PINX (ECMA-143) Primary PINX (ECMA-178) Private Integrated Services Network (PISN) (ECMA-133) Private Integrated services Network eXchange (PINX) (ECMA-133) Secondary PINX (ECMA-178) Signalling (ITU-T Rec. I.112) Supplementary Service (ITU-T Rec. I.210) Supplementary Service Con
37、trol Entity (ECMA-165) Terminating PINX (ECMA-143) Transferring PINX (ECMA-178) Transit PINX (ECMA-143) User (ECMA-142) User determined user busy (ITU-T Rec. I.221) - 3 - 4.2 Other definitions 4.2.1 Activating PINX The Activating PINX is the PINX serving the activating user. 4.2.2 Busy An ISDN desti
38、nation is considered to be busy if either a “network determined user busy“ or a “user determined user busy“ condition exists. 4.2.3 Connected number The number of the user that answers (user C). 4.2.4 Deactivating PINX The Deactivating PINX is the PINX serving the deactivating user. 4.2.5 Diversion
39、Diversion is the redirection of a call, on request of a called user and prior to answer, to a number different from the number of that called user. 4.2.6 Diverted-to number The diverted-to number is the number to which a call is diverted. 4.2.7 Diverted-to PINX The Diverted-to PINX is the PINX servi
40、ng the diverted-to user. 4.2.8 Diverted-to user The diverted-to user is the user to which a call is diverted. 4.2.9 Diverting cause The diverting cause is a parameter which contains the reason for the diversion, e.g. CFU, CFB, CFNR. 4.2.10 Diverting number The diverting number is the number of the s
41、erved user. 4.2.11 Forwarding Forwarding is the type of diversion invoked automatically by the network in accordance with information previously registered in the network against the called number. 4.2.12 Forward switching A network routeing algorithm which performs the diversion by joining together
42、 the first connection from user As node to user Bs node and a second, new connection from user Bs node to user Cs node. 4.2.13 Interrogating PINX The Interrogating PINX is the PINX serving the interrogating user. 4.2.14 Last diverting user The last diverting user is the served user from the point of
43、 view of the diverted-to user for a particular stage of call diversion. In the case of a call subject to a single stage of call diversion, user B is the last diverting user from the point of view of user C. In the case of a call subject to multiple stages of call diversion, user B1 is the last diver
44、ting user from the point of view of user B2, user B2 is the last diverting user from the point of view of user B3, etc. The served user for the final stage of call diversion is the last diverting user from the point of view of user C. 4.2.15 Original called number The original called number is the n
45、umber of user B (in case of multiple call diversion user B1). 4.2.16 Original called user The original called user is the first served user of a call which is subject to one or more stages of call diversion, i.e. user B or B1. - 4 - 4.2.17 Partial rerouteing A network routeing algorithm which perfor
46、ms the call diversion by replacing a particular part of the connection from user As node (located in the public ISDN) to user Bs node (located in a PISN) by another connection from user As node to user Cs node (located in the public ISDN). The new connection is established completely within the publ
47、ic ISDN by joining together the original connection from user As node to the public ISDN gateway node and a second, new connection from the public ISDN gateway node to user Cs node. 4.2.18 Presentation indicator The presentation indicator is the indicator showing whether the diverted-to number shoul
48、d be presented to the calling user, as derived from user Cs Calling/connected Line Identification Restriction (CLIR) supplementary service. 4.2.19 Rerouteing A network routeing algorithm which performs the call diversion by replacing the connection from user As node to user Bs node by another connec
49、tion from user As node to user Cs node. 4.2.20 Rerouteing PINX A Rerouteing PINX is the PINX which executes call diversion. NOTE In case of rerouteing, the Rerouteing PINX is either the Originating PINX or the Incoming Gateway PINX. In case of forward switching, the Rerouteing PINX is the Terminating PINX. 4.2.21 Served user The served user is the user of a particular PISN number who is requesting that calls to his/her number be diverted. This user may also be referred to as the diverting user or the called user. 4.2.2
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