ITU-T Q 2955 1-1997 Stage 3 Description for Community of Interest Supplementary Services Using B-ISDN Digital Subscriber Signalling System No 2 (DSS 2) Closed User Group (CUG) (Stu.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION ITUWT TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2955.1 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - 6-ISDN application protocols for access signalling (06/97) Stage 3 description for community of interest supplementary services using 6-ISDN Digita

2、l Subscriber Signalling System No. 2 (DSS 2): Closed User Group (CUG) ITU-T Recommendation Q.2955.1 (Previously CCIlT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.l-Q.3 Q.4-

3、Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60-Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EX

4、CHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NEMIORK BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling n

5、etwork protocols Common aspects of B-ISDN application protocols for network signalling and interworking B-ISDN application protocols for the network signalling Q.1 OO-Q. 11 9 Q. 1204.249 Q.25O-Q.309 Q. 31 0-Q. 399 Q.4004.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849 Q. 850-Q. 999 Q.1000-Q.1099 Q.1100-Q.11

6、99 Q.1200-Q.1999 Q.2000-Q.2999 Q.2000-Q.2099 Q.2100-Q.2199 Q.2200-Q.2299 signalling and Q.2600-Q.2699 Q.2700-Q.2899 - - Ccss signsiiiing Q.29004.2999 For further details, please refer to ITU-T List of Recommendations - STD-ITU-T RECMN Q-2755-1-ENGL 1777 Li8b2.571 Ob91189 208 ITU-T RECOMMENDATION Q.2

7、955.1 STAGE 3 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SYSTEM No. 2 SS 2): CLOSED USER GROUP (CUG) SERVICES USING B-ISDN DIGITAL SUBSCRIBER SIGNALLING Summary This Recommendation specifies the DSS 2 signalling protocol for the support of the CUG supplementary service in B-ISDN. The protoc

8、ol can be used at the TB and at the coincident SB and T, reference point. The CUG supplementary service enables users to form groups, to and from which access is restricted. Members of a specific closed user group can communicate among themselves but not, in general, with users outside the group. Sp

9、ecific CUG members can have additional capabilities that allow them to originate calls to destinations outside the group, and/or to receive calls from outside the group. Specific CUG members can have additional restrictions that prevent them from originating calls to other members of the CUG or from

10、 receiving calls from other members of the CUG. A specific user may be a member of one or more closed user groups. Source ITU-T Recommendation 4.2955.1 was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 5th of June 1997. FOREWORD ITU (I

11、nternational Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The IT-T is responsible for studying technical, operating and tariff questions and issuing Reco

12、mmendations 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 for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topi

13、cs. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recomm

14、endation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The IT draws attention to the possibility that the practice or implementation of this Recommendation may involve the u

15、se 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 IT members or others outside of the Recommendation development process. As of the date of approval of this Recommenda

16、tion, the ITU hadhad not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database.

17、 O ITU 1998 All 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 ITU. 11 Recommendation Q.2955.1 (06197) 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9

18、 1.10 1.11 1.12 1.13 1.14 1.15 CONTENTS Page . Closed User Group (CUG) 1 Scope 1 References 2 Definitions 3 Abbreviations . 4 Description . 4 Operational requirements 5 5 1.6.1 Provision and withdrawal 1.6.2 Requirements on the originating network side 6 1.6.3 Requirements on the destination network

19、 side 6 . Coding requirements 7 1.7.1 Messages and closed user group information element 7 8 1.7.2 Cause information element Primitive and state definitions 8 1.8.1 Primitive definitions 8 1.8.2 State definitions 8 Signalling procedures at the coincident SB and T, reference point 8 1.9.2 Invocation

20、and operation 8 13 13 15 . 1.9.1 Activation, deactivation and registration 8 Procedures at the TB reference point for interworking with private B-ISDNs . Procedures for interworking between the DSS 1 and the DSS 2 protocol . Interactions with other networks . Interactions with (other) supplementary

21、services . 1 .13.1 Connected line identification presentation 1 .13.2 Connected line identification restriction . 1 .13.3 Calling line identification presentation . 1.13.4 1.13.5 Closed User Group 1.13.6 Direct-Dialling-In 1 .13.7 User-to-user signalling 1.13.8 Multiple subscriber number 1 . 1 3.9 S

22、ub-addressing Parameter values. Dynamic description (SDL) . 1.15.1 The closed user group process . 1 . 1 5.2 Relation to basic call/connection control Calling line identification restriction . 15 15 15 15 15 16 16 16 16 16 16 16 16 19 . Recommendation 4.2955.1 (06/97) 111 Page . Annex A - Symmetric

23、operation 20 Annex B - Protocol extensions to this Recommendation for calls/connections using the . procedures of Recommendation 4.297 1 131 20 iv Recommendation 4.2955.1 (06/97) STD-ITU-T RECMN Q.2955-1-ENGL 1997 4b259L Ob4LL93 739 m Recommendation Q.2955.1 STAGE 3 DESCRIPTION FOR COMMUNITY OF INTE

24、REST SUPPLEMENTARY SYSTEM No. 2 (DSS 2): CLOSED USER GROUP (CUG) (Geneva, 1997) SERVICES USING B-ISDN DIGITAL SUBSCRIBER SIGNALLING 1 Closed User Group (CUG) 1.1 Scope This Recommendation specifies the stage 3 of the Closed User Group (CUG) supplementary services for the Broadband Integrated Service

25、s Digital Network (B-ISDN) at the T, reference point or coincident S, and T, reference point (as defined in Recommendation 1.413 i) by means of the Digital Subscriber Signalling System No. 2 (DSS 2) protocol. Stage 3 identifies the protocol procedures and switching functions needed to support a tele

26、communications service (see Recommendation 1.130 2). In addition, this Recommendation specifies the protocol requirements at the T, reference point where the service is provided to the user via an intermediate private B-ISDN. This Recommendation does not speci the additional protocol requirements wh

27、ere the service is provided to the user via a telecommunications network that is not a B-ISDN. The CUG supplementary service enables users to form groups, to and fi-om which access is restricted. A specific user may be a member of one or more closed user groups. Members of a specific closed user gro

28、up can communicate among themselves but not, in general, with users outside the group. Specific CUG members can have additional capabilities that allow them to originate calls to destinations outside the group, and/or to receive calls from outside the group. Specific CUG members can have additional

29、restrictions that prevent them horn originating calls to other members of the CUG, or from receiving calls from other members of the CUG. The CUG supplementary service is applicable to all telecommunication services. Further part(s) of this Recommendation shall speci the method of testing required t

30、o identi conformance to this Recommendation. This Recommendation is applicable to equipment, supporting the CUG supplementary service, to be attached at either side of a T, reference point or coincident SB and TB reference point when used as an access to the public B-ISDN. The main part of this Reco

31、mmendation specifies the protocol to support the CUG supplementary service in association with point-to-point connections using the procedures described in Recommendation 4.2931 7. To support CUG also in other connection configurations, the modifications required are specified in annexes to this Rec

32、ommendation. Annex By for example, specifies the CUG-protocol for point-to-multipoint connections using the procedures of Recommendation 4.297 1 131. The protocol specified in this Recommendation distinguishes two different types of CUG calls: - Type 1 considers CUG calls with emulated N-ISDN servic

33、es. These services can be identified by the presence of the N-BC information element. NOTE - The exact basic telecommunications service is specified by the content of the N-BC and, if present, of the N-HLC infomation elements 7. Recommendation 4.2955.1 (06/97) 1 STDDITU-T RECMN Q-2955*1-ENGL 1997 48

34、b259L 0641194 b75 For these services, the control of the CUG supplementary service depends on the ISDN numbers (calling and called party) and on the basic telecommunications service involved in the call. This service dependency is required in order to guarantee CUG integrity in the same manner as in

35、 N-ISDN. Type 2 considers CUG calls with B-ISDN applications for which CUG is provided without basic service dependence. No emulated N-ISDN services are involved, and no B-ISDN service type has been specified for these applications. These calls can be identified by the absence of the N-BC informatio

36、n element 7 and by the absence of a coding speciing a B-ISDN service type in the SETUP message (see the paragraph below). For these applications, the control of the CUG supplementary service depends only on the ISDN numbers (calling and called party) involved in the call. In future, the necessity ma

37、y be given to distinguish a third type of CUG call. This type will cover connections with B-ISDN basic services for which a service type is defined (see Recommendation 1.371 12). This type of CUG call is not supported by this Recommendation. In this Recommendation, the control of the CUG supplementa

38、ry service is based on the usage of a, CUG specific infomation element. In order to ease interworking with N-ISDN, some networks may wish to support the control of CUG also by the ROSE components specified in CCITT clause l/Q.955 6. If this additional feature is offered, then the CUG supplementary s

39、ervice shall be provided on the basis of Recommendation 4.955.1 6 with the following additions: - the service types as listed above have to be taken into account; - Note 8 against Table 3 of this Recommendation has to be respected; - - - the facility information element shall be coded as specified i

40、n Recommendation 4.2932 9; in the case of interworking with the N-ISDN, the facility information element shall be mapped in accordance with 6.3 and 6.4/Q.2931 7. The content of the components remains unchanged; and the mapping of return error and cause values shall be in alignment with 1.1 1. - 1.2

41、References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision;

42、 all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. 11 2 CCITT Recommendation I. 130 (1 988)

43、, Method for the characterization of 3 4 5 6 ITU-T Recommendation 1.41 3 (1993), B-ISDN user-network interfaces. telecommunication services supported by an ISDN and network capabilities of an ISDN. ITU-T Recommendation I. 1 12 (1993), Vocabulary and termsfor ISDNs. ITU-T Recommendation 1.2 1 O (1 99

44、3), Principles of telecommunication services supported by an ISDN and the means used to describe them. CCITT Recommendation E. 164 (1991), Numberingplan for the ISDN era. CCITT Recommendation Q.955.1 (1992), Stage 3 description for communi of interest supplementary services using DSS 1 : Closed user

45、 group. 2 Recommendation Q.2955.1 (06/97) ITU-T Recommendation 4.293 1.1 (1 999, Digital Subscriber Signalling Sstem No. 2 - User-Network Interface (UNI) layer 3 specijkation for basic caWconnection control. CCITT Recommendation Z. 1 O0 (1988), Functional specijcation and description language (SDL).

46、 ITU-T Recommendation 4.2932.1 (1 996), Digital subscriber Signalling Sstem No. 2 - Generic finctional protocol: Core finctions. CCITT Recommendation Q.SS.1 (1992), Stage 3 description for community of interest supplementary services using DSS 1 : Closed user group. ITU-T Recommendation 4.2610 (1999

47、, Usage of cause and location in B-ISDN user part and DSS 2. ITU-T Recommendation 1.371 (1996), Trafic control and congestion control in B-BDN. See Annex B of this Recommendation. CCITT Recommendation X. 180 (1 988), Administrative arrangements for international Closed User Groups (CUGs). ITU-T Reco

48、mmendation 4.932 (1993), Generic procedures for the control of ISDN supplementary services. Definitions This Recommendation defines the following terms: 1.3.1 basic telecommunications service: A bearer service or teleservice. The terms “bearer service“ and “teleservice“ are defined in 2.2A.112 3, de

49、finitions 202 and 203. 1.3.2 CUG call: A CUG call is a call which is restricted to a predefined group of users. 1.3.3 CUG index: The closed user group index is a parameter used by the calling user to select a particular closed user group when originating a call. The index is also used by the network to indicate to the called user the closed user group from which an incoming call has originated. This index has only local significance, i.e. the index used by the calling user is, in general, different from the index used by the called us