1、 Standard ECMA-178 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Service Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet
2、: helpdeskecma.ch . Standard ECMA-178 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Service (QSIG-CT) Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL:
3、 http:/www.ecma.ch - Internet: helpdeskecma.ch IW Ecma-178.doc 15-01-02 14,57 . 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 ITU-T
4、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 Transfer supplementary service. The protocol defined in this Standard fo
5、rms 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 active and continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardization bodies. I
6、t represents a pragmatic and widely based consensus. Compared to the 1st Edition of Standard ECMA-178 (published by ECMA in June 1992), the 2nd Edition incorporated changes in order to achieve complete alignment with International Standard ISO/IEC 13869:1995(E) published by ISO/IEC in November 1995.
7、 Compared to the 2nd Edition of Standard ECMA-178 (published by ECMA in September 1997), this 3rd Edition incorporates migration to ASN.1 version 1997. Adopted as 3rd Edition of Standard ECMA-178 by the General Assembly of December 2001. - i - Table of contents 1 Scope 1 2 Conformance 1 3 References
8、 (normative) 1 4 Definitions 2 4.1 External definitions 2 4.2 Other definitions 3 4.2.1 End PINX 3 4.2.2 Primary PINX 3 4.2.3 Redirection number 3 4.2.4 Secondary PINX 3 4.2.5 Transferring PINX 3 5 Acronyms 3 6 Signalling protocol for the support of SS-CT 3 6.1 SS-CT description 3 6.2 SS-CT operatio
9、nal requirements 3 6.2.1 Provision/Withdrawal 3 6.2.2 Requirements on a Transferring PINX 3 6.2.3 Requirements on a Primary PINX 4 6.2.4 Requirements on a Secondary PINX 4 6.2.5 Requirements on a Transit PINX 4 6.3 SS-CT coding requirements 5 6.3.1 Operations 5 6.3.2 Information elements 10 6.3.3 Me
10、ssages 10 6.4 SS-CT state definitions 11 6.4.1 States at a Transferring PINX 11 6.4.2 States at a Primary PINX 11 6.4.3 States at a Secondary PINX 11 6.5 SS-CT signalling procedures 11 6.5.1 Actions at a Transferring PINX 12 6.5.2 Actions at a Primary PINX 14 6.5.3 Actions at a Secondary PINX 15 6.5
11、.4 Actions at a Transit PINX 17 6.5.5 Subsequent actions at a Primary and a Secondary PINX 17 6.6 SS-CT impact of interworking with public ISDNs 18 6.6.1 Actions at a Gateway PINX 18 6.6.2 Actions at other types of PINX 18 6.7 SS-CT impact of interworking with non-ISDNs 18 - ii - 6.7.1 Actions at a
12、Gateway PINX 18 6.7.2 Actions at other types of PINX 19 6.8 Protocol Interactions between SS-CT and other supplementary services and ANFs 19 6.8.1 Calling Name Identification Presentation (SS-CNIP) 20 6.8.2 Connected Name Identification Presentation (SS-CONP) 20 6.8.3 Completion of Calls to Busy Sub
13、scribers (SS-CCBS) 20 6.8.4 Completion of Calls on No Reply (SS-CCNR) 20 6.8.5 Call Forwarding Unconditional (SS-CFU) 20 6.8.6 Call Forwarding Busy (SS-CFB) 20 6.8.7 Call Forwarding No Reply (SS-CFNR) 20 6.8.8 Call Deflection (SS-CD) 21 6.8.9 Path Replacement (ANF-PR) 22 6.9 SS-CT Parameter values (
14、Timers) 23 6.9.1 Timer T1 23 6.9.2 Timer T2 23 6.9.3 Timer T3 23 6.9.4 Timer T4 23 Annex A - Protocol Implementation Conformance Statement (PICS) proforma 25 Annex B - Imported ASN.1 definitions 33 Annex C - Examples of message sequences 35 Annex D - Specification and Description Language (SDL) repr
15、esentation of procedures 43 Annex E - Bibliography 53 Annex F - ASN.1 definitions according to ITU-T Recs. X.208 / X.209 55 1 Scope This Standard specifies the signalling protocol for the support of the Call Transfer supplementary service (SS-CT) at the Q reference point between Private Integrated N
16、etwork services eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). SS-CT is a supplementary service which enables a User to transform two of that Users calls (at least one of which must be answered) into a new call between the two other users in the two calls.
17、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 and stage 2 spec
18、ifications in ECMA-177. The signalling protocol for SS-CT 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. This Standard al
19、so specifies additional signalling protocol requirements for the support of interactions at the Q reference point between Call Transfer and other supplementary services and ANFs. This Standard is applicable to PINXs which can interconnect to form a PISN. 2 Conformance In order to conform to this Sta
20、ndard, 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 standards ar
21、e 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, the number o
22、f 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 (PISN) - Circu
23、it-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 (International Standard
24、 ISO/IEC 11572) ECMA-155 Private Integrated Services Networks - Addressing (International Standard ISO/IEC 11571) ECMA-164 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Name Identification Supplementary Services (International Standard ISO/IEC 13868) ECMA-165 Priv
25、ate Integrated Services Network (PISN) - Generic Functional Protocol for the Support of Supplementary Services - Inter-Exchange Signalling Procedures and Protocol (International Standard ISO/IEC 11582) ECMA-174 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Di
26、version Supplementary Services (International Standard ISO/IEC 13873) ECMA-176 Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Path Replacement Additional Network Feature (International Standard ISO/IEC 13874) - 2 - ECMA-177 Private Integrated Services Network (PISN
27、) - Specification, Functional Model and Information Flows - Call Transfer Supplementary Service (International Standard ISO/IEC 13865) 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
28、 ISDNs (1993) ITU-T Rec. I.210 Principles of telecommunication services supported by an ISDN and the means to describe them (1993) ITU-T Rec. Q.950 Supplementary services protocols, structure and general principles (2000) ITU-T Rec. Z.100 Specification and description language (1999) 4 Definitions F
29、or the purposes of this Standard, the following definitions apply. 4.1 External definitions This Standard uses the following terms defined in other documents: Alerting (ECMA-177) Answered (ECMA-177) Application Protocol Data Unit (APDU) (ECMA-165) Basic Service (ITU-T Rec. I.210) Gateway PINX (ECMA-
30、143) Complete Number (ECMA-155) Interpretation APDU (ECMA-165) Network Facility Extension (NFE) (ECMA-165) Originating PINX (ECMA-165) Primary Call (ECMA-177) Private Integrated Services Network (PISN) (ECMA-133) Private Integrated services Network eXchange (PINX) (ECMA-133) Secondary Call (ECMA-177
31、) Signalling (ITU-T Rec. I.112) Supplementary Service (ITU-T Rec. I.210) Supplementary Service Control Entity (ECMA-165) Terminating PINX (ECMA-165) Transfer by join (ECMA-177) Transfer by rerouteing (ECMA-177) Transit PINX (ECMA-165) User (ECMA-142) User A (ECMA-177) User B (ECMA-177) User C (ECMA-
32、177) - 3 - 4.2 Other definitions 4.2.1 End PINX Within the context of a call, a PINX which is not acting as a Transit PINX, i.e. an Originating PINX, a Terminating PINX, or a Gateway PINX. 4.2.2 Primary PINX The End PINX which is on the end of the Primary Call nearest to User B. 4.2.3 Redirection nu
33、mber The number of a transferred User, as provided to the PINX of the other transferred User. 4.2.4 Secondary PINX The End PINX which is on the end of the Secondary Call nearest to User C. 4.2.5 Transferring PINX End PINX which initiates the call transfer procedures on behalf of User A. 5 Acronyms A
34、PDU Application Protocol Data Unit ASN.1 Abstract Syntax Notation no. 1 ISDN Integrated Services Digital Network NFE Network Facility Extension PNP Private Numbering Plan PICS Protocol Implementation Conformance Statement PINX Private Integrated services Network eXchange PISN Private Integrated Serv
35、ices Network SDL Specification and Description Language SS-CT Supplementary Service Call Transfer 6 Signalling protocol for the support of SS-CT 6.1 SS-CT description Call Transfer (CT) is a supplementary service which enables a user to transform two of that users calls (at least one of which must b
36、e answered) into a new call between the two other users in the two calls. This supplementary service is applicable to all basic services defined in ECMA-142. Call transfer can be achieved by using one of two methods; transfer by join and transfer by rerouteing. Support of transfer by join is mandato
37、ry. Support of transfer by rerouteing is an option, which, if not supported by all PINXs involved in the operation of call transfer, allows fall back to using transfer by join. NOTE When an active call has been transferred to an alerting call, the supervision during the alerting phase and the possib
38、le procedures to be followed in case the alerting call remains unanswered are outside the scope of this Standard. 6.2 SS-CT operational requirements 6.2.1 Provision/Withdrawal Provision and withdrawal shall be in accordance with 6.2.1 of ECMA-177. 6.2.2 Requirements on a Transferring PINX The basic
39、call procedures specified in ECMA-143 shall be supported. Generic procedures for the call-related control of supplementary services, as specified in ECMA-165 for an End PINX, shall apply. - 4 - 6.2.3 Requirements on a Primary PINX The basic call procedures specified in ECMA-143 shall be supported. G
40、eneric procedures for the call-related control of supplementary services, as specified in ECMA-165 for an End PINX, shall apply. 6.2.4 Requirements on a Secondary PINX The basic call procedures specified in ECMA-143 shall be supported. Generic procedures for the call-related control of supplementary
41、 services, as specified in ECMA-165 for an End PINX, shall apply. 6.2.5 Requirements on a Transit PINX The basic call procedures specified in ECMA-143 shall be supported. Generic procedures for the call-related control of supplementary services, as specified in ECMA-165 for a Transit PINX, shall app
42、ly. For SS-CT the requirements are limited to the passing on of Facility information elements for which the destination, as indicated in the NFE, is not the Transit PINX. - 5 - 6.3 SS-CT coding requirements 6.3.1 Operations The operations defined in Abstract Syntax Notation number 1 (ASN.1) in table
43、 1 shall apply. The notation is in accordance with ITU-T Rec. X.680 and X.690. The ITU-T Rec. X.208 and X.209 superseded version is in annex F. Table 1 - Operations in support of SS-CT Call-Transfer-Operations-asn1-97 iso(1) standard(0) pss1-call-transfer(13869) call-transfer-operations-asn1-97 (1)
44、DEFINITIONS EXPLICIT TAGS := BEGIN IMPORTS OPERATION, ERROR FROM Remote-Operations-Information-Objects joint-iso-itu-t(2) remote-operations(4) informationObjects(5) version1(0) EXTENSION, Extension FROM Manufacturer-specific-service-extension-class-asn1-97 iso(1) standard(0) pss1-generic-procedures
45、(11582) msi-class-asn1-97(11) Name FROM Name-Operations-asn1-97 iso(1) standard(0) pss1-name (13868) name-operations-asn1-97 (1) supplementaryServiceInteractionNotAllowed, notAvailable, invalidCallState FROM General-Error-List ccitt (0) recommendation (0) q 950 general-error-list (1) PresentedAddres
46、sScreened, PresentedNumberScreened, PartyNumber, PartySubaddress FROM Addressing-Data-Elements-asn1-97 iso(1) standard(0) pss1-generic-procedures (11582) addressing-data-elements-asn1-97 (20) PSS1InformationElement FROM PSS1-generic-parameters-definition-asn1-97 iso(1) standard (0) pss1-generic-proc
47、edures (11582) pss1-generic-parameters-asn1-97 (17); - TYPE DEFINITIONS FOR CT OPERATIONS FOLLOW Call-Transfer-Operations OPERATION := callTransferIdentify | callTransferAbandon | callTransferInitiate | callTransferSetup | callTransferActive | callTransferComplete | callTransferUpdate | subaddressTr
48、ansfer callTransferIdentify OPERATION := ARGUMENT DummyArg RESULT CTIdentifyRes ERRORS notAvailable | invalidCallState | unspecified | supplementaryServiceInteractionNotAllowed CODE local: 7 - 6 - Table 1 - Operations in support of SS-CT (continued) callTransferAbandon OPERATION := ARGUMENT DummyArg
49、 RETURN RESULT FALSE ALWAYS RESPONDS FALSE CODE local: 8 callTransferInitiate OPERATION := ARGUMENT CTInitiateArg RESULT DummyRes ERRORS notAvailable | invalidCallState | invalidRerouteingNumber | unrecognizedCallIdentity | establishmentFailure | unspecified | supplementaryServiceInteractionNotAllowed CODE local: 9 callTransferSetup OPERATION := ARGUMENT CTSetupArg RESULT DummyRes ERRORS notAvailable | invalidCallState | invalidRerouteingNumber | unrecognizedCallIdentity | unspecified | sup
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