1、INTERNATIONAL TELECOMMUNICATION UNIONITU-TQ.733.3TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU(06/97)SERIES Q: SWITCHING AND SIGNALLINGSpecifications of Signalling System No. 7 ISDNsupplementary servicesStage 3 description for call completionsupplementary services using SignallingSystem No. 7: Compl
2、etion of calls to busysubscriber (CCBS)ITU-T Recommendation Q.733.3(Previously CCITT Recommendation)ITU-T Q-SERIES RECOMMENDATIONSSWITCHING AND SIGNALLINGFor further details, please refer to ITU-T List of Recommendations.SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3INTERNATIONAL AUTOMATIC AN
3、D SEMI-AUTOMATIC WORKING Q.4Q.59FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 Q.120Q.249SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309SPECIFICATIONS OF SIGNALLING SYST
4、EM R1 Q.310Q.399SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499DIGITAL EXCHANGES Q.500Q.599INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.849General Q.700Message transfer part (MTP) Q.701Q.709Signalling connection control part (SCCP) Q.711Q.719Telepho
5、ne user part (TUP) Q.720Q.729ISDN supplementary services Q.730Q.739Data user part Q.740Q.749Signalling System No. 7 management Q.750Q.759ISDN user part Q.760Q.769Transaction capabilities application part Q.770Q.779Test specification Q.780Q.799Q3 interface Q.800Q.849DIGITAL SUBSCRIBER SIGNALLING SYST
6、EM No. 1 Q.850Q.999General Q.850Q.919Data link layer Q.920Q.929Network layer Q.930Q.939User-network management Q.940Q.949Stage 3 description for supplementary services using DSS 1 Q.950Q.999PUBLIC LAND MOBILE NETWORK Q.1000Q.1099INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199INTELLIGENT NETW
7、ORK Q.1200Q.1999BROADBAND ISDN Q.2000Q.2999ITU-T RECOMMENDATION Q.733.3STAGE 3 DESCRIPTION FOR CALL COMPLETION SUPPLEMENTARY SERVICESUSING SIGNALLING SYSTEM No. 7: COMPLETION OF CALLSTO BUSY SUBSCRIBER (CCBS)SummaryCompletion of Calls to Busy Subscribers (CCBS) enables a calling user A, upon encount
8、ering a busydestination B, to be notified when the busy destination B becomes free and to have the serviceprovider reinitiate the call to the specified destination B if user A desires.SourceITU-T Recommendation Q.733.3 was prepared by ITU-T Study Group 11 (1997-2000) and wasapproved under the WTSC R
9、esolution No. 1 procedure on the 5th of June 1997.ii Recommendation Q.733.3 (06/97)FOREWORDITU (International Telecommunication Union) is the United Nations Specialized Agency in the field oftelecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ ofthe ITU.
10、The ITU-T is responsible for studying technical, operating and tariff questions and issuingRecommendations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Conference (WTSC), which meets every four years,establishes the topics f
11、or study by the ITU-T Study Groups which, in their turn, produce Recommendationson these topics.The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down inWTSC Resolution No. 1.In some areas of information technology which fall within ITU-Ts purview, the nece
12、ssary standards areprepared on a collaborative basis with ISO and IEC.NOTEIn this Recommendation, the expression “Administration“ is used for conciseness to indicate both atelecommunication administration and a recognized operating agency.INTELLECTUAL PROPERTY RIGHTSThe ITU draws attention to the po
13、ssibility that the practice or implementation of this Recommendation mayinvolve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence,validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or othersoutside of t
14、he Recommendation development process.As of the date of approval of this Recommendation, the ITU had/had not received notice of intellectualproperty, protected by patents, which may be required to implement this Recommendation. However,implementors are cautioned that this may not represent the lates
15、t information and are therefore strongly urgedto consult the TSB patent database. ITU 1998All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from the
16、ITU.Recommendation Q.733.3 (06/97) iiiCONTENTSPage3 Completion of Calls to Busy Subscriber (CCBS) 13.1 Introduction 13.1.1 Scope. 13.1.2 References. 13.1.3 Terms and definitions 23.1.4 Abbreviations 33.2 Description . 43.2.1 General description . 43.2.2 Specific terminology. 43.2.3 Qualification on
17、the applicability to telecommunication services 43.3 Operational requirements . 43.3.1 Provision/withdrawal 43.3.2 Requirements on the originating network. 53.3.3 Requirements on the terminating network 53.3.4 Requirements on the transit network. 53.4 Coding requirements 53.4.1 Introduction. 53.4.2
18、Coding requirements. 53.4.3 ASN.1 module. 83.5 Signalling requirements 93.5.1 Activation/deactivation/registration 93.5.2 Erasure. 123.5.3 Invocation and operation. 133.5.4 Use of TC and SCCP 183.5.5 Dialogue 193.6 Interaction with other supplementary services. 213.6.1 Call Waiting (CW) 213.6.2 Call
19、 transfer services. 213.6.3 Connected Line Identification Presentation (COLP) 213.6.4 Connected Line Identification Restriction (COLR) 213.6.5 Calling Line Identification Presentation (CLIP). 213.6.6 Calling Line Identification Restriction (CLIR). 213.6.7 Closed User Group (CUG) 213.6.8 Conference C
20、alling (CONF) . 213.6.9 Direct-Dialling-In (DDI). 223.6.10 Call diversion services 223.6.11 Line Hunting . 23iv Recommendation Q.733.3 (06/97)Page3.6.12 Three-Party Service (3PTY) 233.6.13 User-to-User Signalling (UUS). 233.6.14 Multiple Subscriber Number (MSN) 233.6.15 Call Hold (HOLD) 233.6.16 Adv
21、ice of Charge (AOC) 233.6.17 Sub-addressing (SUB). 233.6.18 Terminal Portability (TP) 243.6.19 Completion of Calls to Busy Subscriber (CCBS). 243.6.20 Malicious Call Identification (MCID). 243.6.21 Reverse Charging (REV) 243.6.22 Multi-level precedence and preemption (MLPP) 243.6.23 Private Numberin
22、g Plan (PNP). 243.6.24 International Telecommunication Charge Card (ITCC) . 243.6.25 Global Virtual Network Service (GVNS). 243.7 Interaction with other networks 253.7.1 Interworking with an ISUP network without an ISUP that fully supports theCCBS capability 253.7.2 Interworking with a network witho
23、ut CCBS-ASE capability. 263.7.3 Interworking with a network without SCCP/TC capability 263.7.4 Interworking with an intermediate network without 1993 version of SCCPcapability. 263.7.5 Interworking with PSTN with analogue subscribers using the CCBS service 263.7.6 Interworking with PSTN user . 273.7
24、.7 Procedures for interworking with private ISDNs 273.8 Signalling flows 293.8.1 Normal call B busy indication sent to the calling user. 293.8.2 Normal call Successful CCBS request followed by a successful CCBScall set-up 303.8.3 Unsuccessful CCBS request, terminal activated. 313.8.4 Unsuccessful CC
25、BS request, network destination 313.8.5 Successful CCBS request followed by an unsuccessful CCBS call set-up. 323.8.6 B idle at CCBS request from A. 333.8.7 A busy when B becomes free 333.9 Parameter values. 343.9.1 Timers in the originating local exchange 343.9.2 Timers in the destination local exc
26、hange 343.9.3 Interworking timers. 343.10 Dynamic description. 34Recommendation Q.733.3 (06/97) 1Recommendation Q.733.3STAGE 3 DESCRIPTION FOR CALL COMPLETION SUPPLEMENTARY SERVICESUSING SIGNALLING SYSTEM No. 7: COMPLETION OF CALLSTO BUSY SUBSCRIBER (CCBS)(Geneva, 1997)3 Completion of Calls to Busy
27、Subscriber (CCBS)3.1 Introduction3.1.1 ScopeCompletion of Calls to Busy Subscribers (CCBS) enables a calling user A, upon encountering a busydestination B, to be notified when the busy destination B becomes free and to have the serviceprovider reinitiate the call to the specified destination B if us
28、er A desires.3.1.2 ReferencesThe following ITU-T Recommendations, and other references contain provisions which, throughreference in this text, constitute provisions of this Recommendation. At the time of publication, theeditions indicated were valid. All Recommendations and other references are sub
29、ject to revision; allusers of this Recommendation are therefore encouraged to investigate the possibility of applying themost recent edition of the Recommendations and other references listed below. A list of the currentlyvalid ITU-T Recommendations is regularly published.1 ITU-T Recommendation E.16
30、4 (1997), The international public telecommunicationnumbering plan.2 ITU-T Recommendation I.112 (1993), Vocabulary of terms for ISDNs.3 CCITT Recommendation I.130 (1988), Method for the characterization oftelecommunication services supported by an ISDN and network capabilities of an ISDN.4 ITU-T Rec
31、ommendation I.210 (1993), Principles of telecommunication services supportedby an ISDN and the means to describe them.5 ITU-T Recommendation I.221 (1993), Common specific characteristics of services.6 CCITT Recommendation X.208 (1988), Specification of Abstract Syntax Notation One(ASN.1).ITU-T Recom
32、mendation X.680 (1994)/Amd.1 (1995), Information technology AbstractSyntax Notation One (ASN.1): Specification of basic notation Amendment 1: Rules ofextensibility.7 ITU-T Recommendations Q.711-Q.714 (1996), Signalling connection control part (SCCP).8 ITU-T Recommendations Q.771-Q.775 (1997), Transa
33、ction capabilities application part.9 CCITT Recommendation Q.767 (1991), Application of the ISDN user part of CCITTSignalling System No. 7 for international ISDN interconnections.10 ITU-T Recommendations Q.761-Q.764 (1993), ISDN user part.11 ITU-T Recommendation Q.730 (1993), ISDN supplementary serv
34、ices.2 Recommendation Q.733.3 (06/97)12 ITU-T Recommendation I.253.3 (1996), Call completion supplementary services:Completion of calls to busy subscribers.13 CCITT Recommendation Q.83.3 (1988), Stage 2 description for call completionsupplementary services: Completion of calls to busy subscriber.14
35、ITU-T Recommendation Q.953.3 (1997), Stage 3 description for call completionsupplementary services using DSS1: Completion of Calls to Busy Subscribers (CCBS).15 CCITT Recommendation I.230 (1988), Definition of bearer service categories.16 CCITT Recommendation I.240 (1988), Definition of teleservices
36、.17 CCITT Recommendation F.721 (1992), Videotelephony teleservice for ISDN.18 ITU-T Recommendation Q.715 (1996), Signalling connection control part user guide.3.1.3 Terms and definitionsThe following terms i.e. a) through l) are defined in Recommendation I.253.3. Abbreviated timernames are defined i
37、n the brackets.a) User A.b) Destination B.c) CCBS recall.d) CCBS call.e) Notification B idle.f) Busy.g) Free.h) CCBS busy.i) Retention timer (CCBS-T1).j) CCBS service duration timer (CCBS-T2).k) CCBS recall timer (CCBS-T3).l) Destination B idle guard timer (CCBS-T4).Other terms:m) retain option: The
38、 retain option, if supported in both the originating and destinationnetwork, will maintain the CCBS request in the destination B queue, if a CCBS call has failed due todestination busy condition.n) suspended CCBS request: A request which cannot be served even if destination B is notbusy, because use
39、r A is busy, or CCBS busy.o) long-term denial: The network cannot accept user As request to activate the CCBSsupplementary service and a later attempt to activate the CCBS supplementary service for the samedestination B will also be rejected.p) short-term denial: The network temporarily cannot accep
40、t user As request to activate theCCBS supplementary service. A later attempt to activate the CCBS supplementary service for thesame destination B may succeed.q) CCBS call indicator: Information sent in the forward direction, used in a CCBS call set-upto distinguish this call from an ordinary call at
41、 the destination local exchange.Recommendation Q.733.3 (06/97) 3r) CCBS indicator: Indicator used in the diagnostic field, sent in the cause parameter in thebackward release message, at the initial call failure, to indicate the possibility to invoke a possiblesucceeding CCBS service request.s) CCBS
42、request: An instance of an activation of the CCBS supplementary service which isheld in a queue pending the correct conditions for the CCBS supplementary service to be completed.t) compatible terminal: A terminal which can support the bearer service or teleservicerequested for the original call to d
43、estination B and which can accept calls to the ISDN number andsubaddress identifying the called user in the original call to destination B.3.1.4 AbbreviationsThis Recommendation uses the following abbreviations.ACM Address Complete MessageANM Answer MessageASE Application Service ElementASN.1 Abstra
44、ct Syntax Notation oneATP Access Transport ParameterCCBS Completion of Calls to Busy Subscriber (CCBS) supplementary serviceCCSS Call Completion Service Set-upCFB Call Forwarding BusyCFNR Call Forwarding No ReplyCFU Call Forwarding UnconditionalCLI Calling Line IdentificationDLE Destination Local Ex
45、changeDSS 1 Digital Subscriber Signalling System No. 1GT Global TitleHLC High Layer CompatibilityIAM Initial Address MessageIPI ISDN user part Preference IndicatorISDN Integrated Services Digital NetworkISPBX Integrated Services Private Branch ExchangeISUP Integrated Services Digital Network User Pa
46、rtLLC Low Layer CompatibilityOLE Originating Local ExchangeOU Originating UserREL Release MessageRLC Release Complete MessageSCCP Signalling Connection Control PartSDL Specification and Description Language4 Recommendation Q.733.3 (06/97)SPC Signalling Point CodeSSN SubSystem NumberSUB Sub-addressTC
47、 Transaction CapabilitiesTE Transit ExchangeTU Terminating UserUSI User Service Information3.2 Description3.2.1 General descriptionAfter receiving a busy indication (e.g. tones or messages), user A may request the CCBSsupplementary service. The network will then monitor the wanted destination B for
48、becoming free.When the wanted destination B becomes free, then the network will wait a short time in order toallow the resources to be re-used for originating a call. If the resources are not re-used bydestination B within this time, then the network will automatically recall user A.When user A acce
49、pts the CCBS recall, then the network will automatically generate a CCBS call todestination B.3.2.2 Specific terminologySee 3.1.3, terms and definitions.3.2.3 Qualification on the applicability to telecommunication servicesThe CCBS supplementary service shall be applicable to all circuit mode bearer services defined inRecommendation I.230 15, and all teleservices defined in Recommendation I.240 16 with thefollowing exceptions:a) call 2 of the videotelephony service (see Recommendation F.721 17);b) a
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