1、Standard ECMA-2252nd Edition - June 1997Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chPrivate Integrated Services Network(PISN) -Inter-Exchange Signalling Protocol -Transit CounterAdditional Netw
2、ork Feature.Standard ECMA-2252nd Edition - June 1997Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chIW Ecma-225.doc 25-08-97 14,18Private Integrated Services Network(PISN) -Inter-Exchange Signallin
3、g Protocol -Transit CounterAdditional Network Feature(QSIG-TC).Brief HistoryThis Standard is one of a series of ECMA Standards defining services and signalling protocols applicable to Private IntegratedServices Networks (PISNs). The series uses ISDN concepts as developed by ITU-T and conforms to the
4、 framework ofInternational Standards for Open Systems Interconnection as defined by ISO/IEC. It has been produced under ETSI work itemDE/ECMA-00146.This particular Standard specifies the signalling protocol for use at the Q reference point in support of the Transit Counteradditional network feature.
5、 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 active andcontinuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international
6、 and national standardizationbodies. It represents a pragmatic and widely based consensus.Compared to the 1st Edition of Standard ECMA-225 (published by ECMA in June 1995), this 2nd Edition incorporateschanges in order to achieve complete alignment with International Standard ISO/IEC 15056:1997(E) p
7、ublished by ISO/IEC inMay 1997.Differences between this ECMA Standard and the ISO/IEC International Standard with which it is aligned are clearlyidentified.Adopted as 2nd Edition of Standard ECMA-225 by the General Assembly of June 1997.- i -Table of contents1 Scope 12 Conformance 13 References (nor
8、mative) 14 Definitions 24.1 External definitions 25 List of acronyms 36 Signalling protocol for the support of ANF-TC 36.1 ANF-TC description 36.2 ANF-TC operational requirements 36.2.1 Requirements on the Originating PINX 36.2.2 Requirements on the Terminating PINX 46.2.3 Requirements on a Transit
9、PINX 46.3 ANF-TC coding requirements 46.3.1 Transit counter information element 46.3.2 Messages 46.4 ANF-TC signalling procedures 46.4.1 Actions at the Originating PINX 56.4.2 Actions at the Terminating PINX 56.4.3 Actions at a Transit PINX 56.4.4 Actions at an Incoming Gateway PINX 56.4.5 Actions a
10、t an Outgoing Gateway PINX 56.5 Protocol interactions between ANF-TC and other supplementary services and ANFs 56.5.1 Interaction with Calling Name Identification Presentation (SS-CNIP) 66.5.2 Interaction with Connected Name Identification Presentation (SS-CONP) 66.5.3 Interaction with Completion of
11、 Calls to Busy Subscribers (SS-CCBS) 66.5.4 Interaction with Completion of Calls on No Reply (SS-CCNR) 66.5.5 Interaction with Call Transfer (SS-CT) 66.5.6 Interaction with Call Forwarding Unconditional (SS-CFU) 66.5.7 Interaction with Call Forwarding Busy (SS-CFB) 66.5.8 Interaction with Call Forwa
12、rding No Reply (SS-CFNR) 66.5.9 Interaction with Call Deflection (SS-CD) 66.5.10 Interaction with Path Replacement (ANF-PR) 66.5.11 Interaction with Call Offer (SS-CO) 76.5.12 Interaction with Do Not Disturb (SS-DND) 76.5.13 Interaction with Do Not Disturb Override (SS-DNDO) 76.5.14 Interaction with
13、 Call Intrusion (SS-CI) 76.5.15 Interaction with Call Interception (ANF-CINT) 76.5.16 Interaction with Recall (SS-RE) 7- ii -6.5.17 Interaction with Advice of Charge (SS-AOC) 76.5.18 Interaction with Cordless Terminal Location Registration (SS-CTLR) 76.5.19 Interaction with Cordless Terminal Mobilit
14、y Incoming Call (ANF-CTMI) 7Annex A - Protocol Implementation Conformance Statement (PICS) proforma 91ScopeThis Standard specifies the signalling protocol for the support of the Transit Counter additional network feature (ANF-TC) at the Q reference point between Private Integrated Services Network E
15、xchanges (PINXs) connected togetherwithin a Private Integrated Services Network (PISN).ANF-TC is a feature that limits the number of Transit PINXs that a call setup request may be routed through e.g., toprotect the network against indefinite looping.The Q reference point is defined in ISO/IEC 11579-
16、1.Service specifications are produced in three stages and according to the method specified in ETS 300 387. ThisStandard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by thestage 1 and stage 2 specifications in ECMA-224.The signalling protocol
17、 for ANF-TC operates in association with the signalling protocols for basic circuit switched callcontrol (as specified in ECMA-143) and call independent (connection oriented) signalling connections (as specified inECMA-165).This Standard also specifies additional signalling protocol requirements for
18、 the support of interactions at the Qreference point between ANF-TC and other supplementary services and ANFs.This Standard is applicable to PINXs that can interconnect to form a PISN.2 ConformanceIn order to conform to this Standard, a PINX shall satisfy the requirements identified in the Protocol
19、ImplementationConformance Statement (PICS) proforma in annex A.Conformance to this Standard includes conforming to those clauses that specify protocol interactions between ANF-TCand other supplementary services and ANFs for which signalling protocols at the Q reference point are supported inaccordan
20、ce with the stage 3 standards concerned.3 References (normative)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 investiga
21、te thepossibility 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 of theappropriate ISO/IEC International Standard is given in brackets after the ECMA reference.ECMA-14
22、2 Private Integrated Services Network - Circuit-mode 64 kbit/s Bearer Services - ServiceDescription, Functional Capabilities and Information Flows (International StandardISO/IEC 11574)ECMA-143 Private Integrated Services Network - Circuit-mode Bearer Services - Inter-Exchange SignallingProcedures an
23、d Protocol (International Standard ISO/IEC 11572)ECMA-165 Private Integrated Services Network - Generic Functional Protocol for the Support ofSupplementary Services - Inter-Exchange Signalling Procedures and Protocol (InternationalStandard ISO/IEC 11582)ECMA-174 Private Integrated Services Network -
24、 Inter-Exchange Signalling Protocol - Call DiversionSupplementary Services (International Standard ISO/IEC 13873)ECMA-176 Private Integrated Services Network - Inter-Exchange Signalling Protocol - Path ReplacementAdditional Network Feature (International Standard ISO/IEC 13874)ECMA-178 Private Integ
25、rated Services Network - Inter-Exchange Signalling Protocol - Call TransferSupplementary Services (International Standard ISO/IEC 13869)ECMA-186 Private Integrated Services Network - Inter-Exchange Signalling Protocol - Call CompletionSupplementary Services (International Standard ISO/IEC 13870)- 2
26、-ECMA-221 Private Integrated Services Network - Inter-Exchange Signalling Protocol - Call InterceptionAdditional Network Feature (International Standard ISO/IEC 15054)ECMA-224 Private Integrated Services Network - Specification, Functional Model and Information Flows -Transit Counter Additional Netw
27、ork Feature (International Standard ISO/IEC 15055)ISO/IEC 11579-1 Information technology - Telecommunications and information exchange between systems -Private Integrated Services Network - Part 1: Reference configuration for PISN Exchanges(PINX)ETS 300 387 Private Telecommunication Network (PTN); M
28、ethod for the specification of basic andsupplementary 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 ISDN and the means to describe them(1993)4 DefinitionsFor the purposes of this Standard, the following d
29、efinitions apply.4.1 External definitionsThis Standard uses the following terms defined in other documents: Basic Service (ITU-T Rec. I.210) Call, Basic Call (ECMA-165) Call Independent Signalling Connection (ECMA-165) CC Call (ECMA-186) Cooperating PINX (ECMA-176) Diverted-to PINX (ECMA-174) Divert
30、ed-to User (ECMA-174) Incoming Gateway PINX (ECMA-143) Incoming Side (ECMA-143) Inter-PTNX Link (ECMA-143) Originating PINX (ECMA-143) Outgoing Gateway PINX (ECMA-143) Outgoing Side (ECMA-143) Path Reservation (ECMA-186) Preceding PINX (ECMA-143) Primary PINX (ECMA-178) Private Integrated Services N
31、etwork (PISN) (ISO/IEC 11579-1) Private Integrated Services Network Exchange (PINX) (ISO/IEC 11579-1) Requesting PINX (ECMA-176) Rerouteing PINX (ECMA-174) Secondary PINX (ECMA-178) Signalling (ITU-T Rec. I.112) Subsequent PINX (ECMA-143)- 3 - Supplementary Service (ITU-T Rec. I.210) Terminating PIN
32、X (ECMA-143) Transit PINX (ECMA-143)5 List of acronymsANF Additional Network FeatureANF-PR Path Replacement Additional Network FeatureANF-TC Transit Counter Additional Network FeatureISDN Integrated Services Digital NetworkPICS Protocol Implementation Conformance StatementPINX Private Integrated Ser
33、vices Network ExchangePISN Private Integrated Services NetworkSS-CC Call Completion Supplementary ServicesSS-CCBS Completion of Calls to Busy Subscribers Supplementary ServiceSS-CCNR Completion of Calls on No Reply Supplementary ServiceSS-CD Call Deflection Supplementary ServiceSS-CFU Call Forwardin
34、g Unconditional Supplementary ServiceSS-CFB Call Forwarding Busy Supplementary ServiceSS-CFNR Call Forwarding No Reply Supplementary ServiceSS-CT Call Transfer Supplementary ServiceSS-DIV Diversion Supplementary Services6 Signalling protocol for the support of ANF-TC6.1 ANF-TC descriptionANF-TC is i
35、nvoked when it is desired to limit the number of Transit PINXs that a call setup request may be routedthrough.ANF-TC may be used in conjunction with either a Basic call setup request or a setup request for a call independent(connection oriented) signalling connection.Use of ANF-TC is a network optio
36、n. The criteria for determining: when ANF-TC should be invoked; the number of PINXs through which a call may be routed; and, the means by which the feature is activated or deactivatedare network dependent and outside the scope of this Standard.6.2 ANF-TC operational requirements6.2.1 Requirements on
37、 the Originating PINXCall establishment procedures for the outgoing side of an inter-PINX link and call release procedures, asspecified in ECMA-143, shall apply.If the PINX supports connection-oriented APDU transport, then the generic procedures for the call independentcontrol (connection oriented)
38、of supplementary services, as specified in ECMA-165 for an Originating PINX,shall apply.- 4 -6.2.2 Requirements on the Terminating PINXCall establishment procedures for the incoming side of an inter-PINX link and call release procedures, asspecified in ECMA-143, shall apply.If the PINX supports conn
39、ection-oriented APDU transport, then the generic procedures for the call independentcontrol (connection oriented) of supplementary services, as specified in ECMA-165 for a Terminating PINX,shall apply.6.2.3 Requirements on a Transit PINXBasic call procedures for call establishment and call clearing
40、at a Transit PINX, as specified in ECMA-143 shallapply.If the PINX supports connection-oriented APDU transport, then the generic procedures for the call independentcontrol (connection oriented) of supplementary services, as specified in ECMA-165 for a Transit PINX, shallapply.6.3 ANF-TC coding requi
41、rements6.3.1 Transit counter information elementANF-TC shall be encoded as a discrete information element (called Transit counter) within codeset 4 (ISOcodeset), according to the rules for the general format and coding of variable length information elements definedin 14.5.1 of ECMA-143.The Transit
42、counter information element shall be a variable length category 1 (see 10.4.11.2 of ECMA-143)information element with the format shown in figure 1 and coded as shown in table 1.87654321Transit counter0 0 1 1 0 0 0 1 Octet 1Information element identifierLength of transit counter contents Octet 21 0 0
43、 Transit count Octet 3ext Reserved (binary value)Figure 1 - Transit counter information elementTable 1 - Transit counter information elementTransit count (octet 3)A binary value (in the range 0 - 31) that indicates the number ofTransit PINXs through which the SETUP request has alreadypassed.The maxi
44、mum number of Transit PINXs through which a SETUPrequest may pass is a network dependent value.6.3.2 MessagesIf used, the Transit counter information element shall be conveyed in a SETUP message.One of the shift information elements (see 14.5.3 and 14.5.4 of ECMA-143) shall precede the Transit count
45、erinformation element in the SETUP message.6.4 ANF-TC signalling proceduresThe signalling protocol for Transit counter functionality operates in association with the signalling protocols forbasic circuit switched call control (as specified in ECMA-143) and call independent (connection oriented) sign
46、allingconnections (as specified in ECMA-165).NOTEThe actions specified in the following subclauses are applicable to both cases.- 5 -Where a reference is made to procedures specified in ECMA-143 and ECMA-165, the interpretation of suchreference should be made according to whether the call concerned
47、is a basic call or a call independent signallingconnection.6.4.1 Actions at the Originating PINXAn Originating PINX may include a Transit counter information element in the SETUP message sent across aninter-PINX link. The value of the transit count field shall be set to zero.6.4.2 Actions at the Ter
48、minating PINXA Terminating PINX shall ignore the Transit counter information element if it is contained in any receivedSETUP message.6.4.3 Actions at a Transit PINX6.4.3.1 Normal proceduresOn receipt of a SETUP message from the Preceding PINX, the call request shall be processed according to theproc
49、edures specified in ECMA-143 and ECMA-165.If the received SETUP message contains a Transit counter information element in which the transit count fieldhas a value that is less than the acceptable (network dependent) limit, that information element shall beincluded in the SETUP message sent to the Subsequent PINX. The value of the transit count field in theoutgoing Transit counter information element shall be set to one greater than the value received.If the received SETUP message does not contain a Transit counter information element, the Transit PINX mayinc
