1、 Standard ECMA-176 4th Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Path Replacement Additional Network Feature Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch -
2、Internet: helpdeskecma.ch . Standard ECMA-176 4th Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Path Replacement Additional Network Feature (QSIG-PR) Phone: +41 22 849.60.00 - Fax: +41 22
3、849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.ch IW Ecma-176.doc 14-01-02 14,23 . 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 dev
4、eloped by ITU-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 Path Replacement additional network feature. The protocol def
5、ined 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 active and continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national s
6、tandardization bodies. It represents a pragmatic and widely based consensus. The 3rd edition of this ECMA Standard was technically aligned with the 2nd Edition International Standard ISO/IEC 13874 published by ISO/IEC in January 1999. Compared to the 3rd Edition of Standard ECMA-176 (published by EC
7、MA in December 1998), this 4th Edition incorporates migration to ASN.1 version 1997. Adopted as 4th Edition of Standard ECMA-176 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
8、 definitions 2 4.2.1 Branching PINX 2 4.2.2 Cooperating PINX 3 4.2.3 End PINX 3 4.2.4 Preceding PINX 3 4.2.5 Replaced connection 3 4.2.6 Requesting PINX 3 4.2.7 Retained connection 3 4.2.8 Subsequent PINX 3 4.2.9 Inviting PINX 3 5 List of acronyms 3 6 Signalling protocol for the support of ANF-PR 3
9、6.1 ANF-PR description 3 6.2 ANF-PR operational requirements 4 6.2.1 Requirements on the Cooperating PINX 4 6.2.2 Requirements on the Requesting PINX 4 6.2.3 Requirements on a Transit PINX 4 6.2.4 Requirements on the Inviting PINX 5 6.3 ANF-PR coding requirements 6 6.3.1 Operations 6 6.3.2 Informati
10、on elements 9 6.3.3 Messages 10 6.4 ANF-PR state definitions 10 6.4.1 States at the Requesting PINX 10 6.4.2 States at the Cooperating PINX 10 6.4.3 States at a Transit PINX on the retained path, including the branching PINX 11 6.4.4 States at the Inviting PINX 11 6.5 ANF-PR signalling procedures 11
11、 6.5.1 Actions at the Requesting PINX 11 6.5.2 Actions at the Cooperating PINX 13 6.5.3 Actions at a Cooperating/Requesting PINX in the case of a trombone connection 14 6.5.4 Actions at a Transit PINX 14 6.5.5 Actions at Inviting PINX 14 - ii - 6.6 ANF-PR optional signalling procedures for retention
12、 of part of the old connection 14 6.6.1 Actions at the Requesting PINX 14 6.6.2 Actions at the Cooperating PINX 15 6.6.3 Actions at a Transit PINX on the retained connection 15 6.6.4 Actions at a Transit PINX on the new connection or replaced connection 17 6.6.5 Actions at Inviting PINX on the retai
13、ned connection 17 6.7 ANF-PR impact of interworking with public ISDNs 17 6.8 ANF-PR impact of interworking with non-ISDNs 17 6.9 Protocol interactions between ANF-PR and other supplementary services and ANFs 18 6.9.1 Interaction with Calling Name Identification Presentation (SS-CNIP) 18 6.9.2 Intera
14、ction with Connected Name Identification Presentation (SS-CONP) 18 6.9.3 Interaction with Completion of Calls to Busy Subscriber (SS-CCBS) 18 6.9.4 Interaction with Completion of Calls on No Reply (SS-CCNR) 18 6.9.5 Interaction with Call Transfer (SS-CT) 18 6.9.6 Interaction with Call Forwarding Unc
15、onditional (SS-CFU) 19 6.9.7 Interaction with Call Forwarding Busy (SS-CFB) 19 6.9.8 Interaction with Call Forwarding No Reply (SS-CFNR) 19 6.9.9 Interaction with Call Deflection (SS-CD) 19 6.10 ANF-PR parameter values (timers) 20 6.10.1 Timer T1 20 6.10.2 Timer T2 20 6.10.3 Timer T3 20 6.10.4 Timer
16、 T4 20 Annex A - Protocol Implementation Conformance Statement (PICS) proforma 21 Annex B - Imported ASN.1 definitions 29 Annex C - Examples of message sequences 31 Annex D - Specification and Description Language (SDL) representation of procedures 39 Annex E - ASN.1 definitions according to ITU-T R
17、ecs. X.208 / X.209 45 1 Scope This Standard specifies the signalling protocol for the support of the Path Replacement additional network feature (ANF-PR) at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Net
18、work (PISN). ANF-PR is a feature which applies to an established call, allowing that calls connection between PINXs to be replaced by a new connection. 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 3
19、87. This Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ECMA-175. The signalling protocol for ANF-PR operates on top of the signalling protocol for basic circuit switched call control, as sp
20、ecified in ECMA-143, and uses certain aspects of the generic procedures for the control of supplementary services specified in ECMA-165. This Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between ANF-PR and other suppleme
21、ntary services and ANFs. This Standard is applicable to PINXs which can interconnect to form a PISN. 2 Conformance In order to conform to this Standard, a PINX shall satisfy the requirements identified in the Protocol Implementation Conformance Statement (PICS) proforma in annex A. 3 References (nor
22、mative) The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. All 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
23、 of the standards indicated below. In the case of references to ECMA Standards that are aligned with ISO/IEC International Standards, the number of the appropriate ISO/IEC International Standard is given in brackets after the ECMA reference. ECMA-133 Private Integrated Services Network (PISN) - Refe
24、rence Configuration for PISN Exchanges (PINX) (International Standard ISO/IEC 11579-1) ECMA-142 Private Integrated Services Network (PISN) - Circuit-mode 64 kbit/s Bearer Services - Service Description, Functional Capabilities and Information Flows (International Standard ISO/IEC 11574) ECMA-143 Pri
25、vate Integrated Services Network (PISN) - Circuit-mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (International Standard ISO/IEC 11572) ECMA-155 Private Integrated Services Networks - Addressing (International Standard ISO/IEC 11571) ECMA-165 Private Integrated Services Net
26、work (PISN) - Generic Functional Protocol for the Support of Supplementary Services - Inter-Exchange Signalling Procedures and Protocol (International Standard ISO/IEC 11582) ECMA-175 Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Path Replacemen
27、t Additional Network Feature (International Standard ISO/IEC 13863) ECMA-178 Private Integrated Services Network (PISN) - Inter-exchange Signalling Protocol - Call Transfer Supplementary Services (International Standard ISO/IEC 13869) - 2 - ECMA-225 Private Integrated Services Network (PISN) - Inter
28、-exchange Signalling Protocol - Transit Counter Additional Network Feature (International Standard ISO/IEC 15056) 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 R
29、ec. 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 For the purposes of th
30、is Standard, the following definitions apply. 4.1 External definitions This Standard uses the following terms defined in other documents: ANF-PR user (ECMA-175) Application Protocol Data Unit (APDU) (ECMA-165) Basic Service (ITU-T Rec. I.210) Call, Basic Call (ECMA-165) Connection (ECMA-175) Incomin
31、g Gateway PINX (ECMA-143) Interpretation APDU (ECMA-165) Network Facility Extension (NFE) (ECMA-165) New Connection (ECMA-175) Old Connection (ECMA-175) Originating PINX (ECMA-143) Outgoing Gateway PINX (ECMA-143) Private Integrated Services Network (PISN) (ECMA-133) Private Integrated services Netw
32、ork eXchange (PINX) (ECMA-133) Signalling (ITU-T Rec. I.112) Supplementary Service (ITU-T Rec. I.210) Supplementary Services Control Entity (ECMA-165) Terminating PINX (ECMA-143) Transit PINX (ECMA-143) Trombone Connection (ECMA-175) User (except in the context of ANF-PR user) (ECMA-142) 4.2 Other d
33、efinitions 4.2.1 Branching PINX The Transit PINX at which the retained connection finishes and the new connection starts. - 3 - 4.2.2 Cooperating PINX The end PINX which initiates the establishment of the new connection towards other end PINX involved in the call. 4.2.3 End PINX Within the context o
34、f a call, a PINX which is not acting as a Transit PINX, i.e., an Originating PINX, a Terminating PINX, an Incoming Gateway PINX or an Outgoing Gateway PINX. 4.2.4 Preceding PINX The adjacent PINX in the direction of the Cooperating PINX, relative to a particular PINX involved in the old connection.
35、NOTE 1 This can be the Cooperating PINX itself or a Transit PINX. 4.2.5 Replaced connection That part of the old connection which is not retained and is replaced by the new connection. 4.2.6 Requesting PINX The end PINX which invokes ANF-PR and towards which the new connection is routed. 4.2.7 Retai
36、ned connection That part of the old connection which is retained and not replaced by the new connection. 4.2.8 Subsequent PINX The adjacent PINX in the direction of the Requesting PINX, relative to a particular PINX involved in the old connection. NOTE 2 This can be the Requesting PINX itself or a T
37、ransit PINX. 4.2.9 Inviting PINX Any PINX in the connection that is associated with the ANF-PR user and able to request either end PINX to invoke ANF-PR. 5 List of acronyms ANF Additional Network Feature ANF-PR Path Replacement additional network feature APDU Application Protocol Data Unit ASN.1 Abs
38、tract Syntax Notation no. 1 ISDN Integrated Services Digital Network NFE Network Facility Extension PICS Protocol Implementation Conformance Statement PINX Private Integrated services Network eXchange PISN Private Integrated Services Network SDL Specification and Description Language SS-CT Call Tran
39、sfer supplementary service 6 Signalling protocol for the support of ANF-PR 6.1 ANF-PR description ANF-PR is invoked by an established call, allowing that calls connection through the PISN to be replaced by a new connection. Optionally, the direction of the new connection may be decided by the ANF-PR
40、 user. - 4 - If the new connection is required to satisfy certain criteria, ANF-PR should be used in conjunction with other supplementary services and/or ANFs. In the absence of specific criteria, the new connection should be established using the routeing rules which apply to basic call establishme
41、nt. NOTE 3 Annex A of ECMA-175 gives examples of the circumstances under which ANF-PR can be used and criteria which can govern the selection of the new connection. ANF-PR may be initiated locally at the Requesting PINX or optionally from an Inviting PINX. The Requesting PINX shall request the Coope
42、rating PINX to attempt the establishment of a new connection from the Cooperating PINX to the Requesting PINX. If successful, the new connection shall replace the old connection. NOTE 4 The Requesting PINX can be either end PINX involved in a call, i.e., the Originating PINX or the Terminating PINX
43、or, in the case of interworking with another network, the Incoming Gateway PINX or Outgoing Gateway PINX. Optional procedures and coding are specified for allowing the retention of one or more elements of the old connection, starting from the Cooperating PINX and continuing as far as a Transit PINX,
44、 subject to any given criteria being achievable in that way. A new connection is established from the Transit PINX to the Requesting PINX instead of from the Cooperating PINX to the Requesting PINX. 6.2 ANF-PR operational requirements 6.2.1 Requirements on the Cooperating PINX ANF-PR shall be applic
45、able to a call whose protocol control state, as defined in ECMA-143, is Active. NOTE 5 State Active will have been reached as a result of ECMA-143 call establishment procedures, possibly in conjunction with supplementary service and/or ANF procedures. ECMA-143 protocol control procedures for call es
46、tablishment at the outgoing side of an inter-PINX link shall apply to the establishment of the new connection. ECMA-143 protocol control procedures for call clearing shall apply to the release of the old connection in the event of successful switch over to the new connection. Generic procedures for
47、the call-related control of supplementary services, as specified in ECMA-165 for an end PINX, shall apply. 6.2.2 Requirements on the Requesting PINX ANF-PR shall be applicable to a call whose protocol control state, as defined in ECMA-143, is Active. NOTE 6 State Active will have been reached as a r
48、esult of ECMA-143 call establishment procedures, possibly in conjunction with supplementary service and/or ANF procedures. ECMA-143 protocol control procedures for call establishment at the incoming side of an inter-PINX link shall apply to the establishment of the new connection. ECMA-143 protocol
49、control procedures for call clearing shall apply to the release of the old connection in the event of successful switch over to the new connection. Generic procedures for the call-related control of supplementary services, as specified in ECMA-165 for an end PINX, shall apply. 6.2.3 Requirements on a Transit PINX 6.2.3.1 Transit PINX involved in the replaced connection ANF-PR shall be applicable to a call whose protocol control state, as defined in ECMA-143, on each of the two links (incoming and outgoing) is Active and whose call control state
