1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2735.1 (06197) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for the network si g n al 1 i n g Stage 3 description for community of interest supplementary services for B-I
2、SDN using SS No.7: Closed User Group (CUG) ITU-T Recommendation Q.2735. I (Previously CCIlT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SE
3、RVICES IN THE ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.l-Q.3 Q .4-Q .59 Signalling for satellite systems Q.48-Q.49 Q.604.99 Q.100-(2.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF
4、SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK Q.120-Q.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849 Q.85 04.999 Q. 1000-Q. 1 O99 I
5、NTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1 1004.1 199 I INTELLIGENT NETWORK Q. 12004.1999 BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling network protocols Q.200-Q.2999 Q.20004.2099 Q.21004.2199 Q.22004.2299 1 Common aspects of B-ISDN application protocols for acc
6、ess signalling and Q.2600-Q.2699 network signalling and interworking ilII For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.2735.1 STAGE 3 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES FOR B-ISDN USING SS NO. 7: CLOSED USER GROUP (CUG) Summary
7、This Recommendation specifies the stage 3 of the Closed User Group (CUG) supplementary service for the Broadband Integrated Services Digital Network (B-ISDN) at the Network Node Interface (“I) by means of the Broadband ISDN User Pari (3-ISUP) protocol. Closed User Group (CUG) enables users to form g
8、roups, to and from which access is restricted. A specific user may be a member of one or more CUGs. Members of a specific CUG can communicate among themselves, but not with users outside the group. Specific CUG members can have additional capabilities, that allow them to originate calls outside the
9、group, andor 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 fkom receiving calls fiom other members of the CUG. Source ITU-T Recommendation Q.2735.1 was prepared by ITU-T Study Gr
10、oup 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 5th of June 1997. FOREWORD ITIJ (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector TU-T) is a perman
11、ent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years,
12、 establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall wit
13、hin ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS
14、 The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The IT takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted b
15、y ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had/had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautione
16、d that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O IT 1997 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 microfi
17、lm, without permission in writing from the IT. Recommendation Q.2735.1 (06/97) II STD.ITU-T RECMN Q.2735-1-ENGL 1997 48b259L Ob39b2 898 m 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 CONTENTS Page Closed User Group (CUG) . Scope References Definitions and abbreviations . 1.3.1 Definitions . 1.3.2 Abbr
18、eviations Description . Specification model CUG application process functions 1.6.1 Primitive interface MISACF 1.6.2 Procedures . SACF 1.7.1 Primitive interface SACFMTP . 1.7.2 Procedures . CUG ASE . 1.8.1 Primitive interface SACFCUG ASE 1.8.2 Procedures . Interactions . 1.9.1 Interactions with CS 1
19、 . 1.9.2 Interactions with other supplementary services Interworking . 1.10.1 Interworking with ISUP 1.10.2 Interworking with DSS 2 . Appendix I . Instruction indicator setting . Recommendation 4.2735.1 (06/97) 1 2 3 11 11 11 12 iii STD.ITU-T RECMN Q.2735-1-ENGL 1997 m 48b259L Ob39b83 724 m Recommen
20、dation Q.2735.1 STAGE 3 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY (Geneva, 1997) SERVICES FOR B-ISDN USING SS NO. 7: CLOSED USER GROUP (CUG) 1 Closed User Group (CUG) 1.1 Scope This Recommendation specifies the stage 3 of the Closed User Group (CUG) supplementary service for the Broadband
21、Integrated Services Digital Network (B-ISDN) at the Network Node Interface (“I) by means of the Broadband ISDN User Part (B-ISUP) protocal. 1.2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this
22、Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; ail users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and oth
23、er references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU Recommendation E. 164 (1 997), The international public telecommunication numbering plan. CCITT Recommendation 1.255.1 (1 992), Community of interest supplementary services: Closed User Group.
24、 CCITT Recommendation Q.85.1 (1992), Stage 2 description for communig of interest supplementary services: Closed User Group. ITU Recommendation 4.2650 (1 995), Interworking between Signalling System No. 7 Broadband ISDN User Part (B-ISUP) and Digital Subscriber Signalling System No. 2 (DSS 2). ITU R
25、ecommendation 4.2660 (1 999, Interworking between Signalling System No. 7 - Broadband ISDN User Part (B-ISUP) and Narrow-band ISDN User Part (N-ISUP). ITU Recommendation Q.2730 (1995), Signalling System No. 7 B-ISDN User Part (B-ISUP) - Supplementary services. ITU Recornendation 4.2761 (1995), Funct
26、ional descrlption of the B-ISDN User Part (B-ISUP) of Signalling System No. 7. ITU Recommendation 4.2762 (1995), General functions of messages and signals of the B-ISDN User Part (B-ISUP) of Signalling System No. 7. ITU Recommendation Q.2763 (1995), Signalling System No. 7 B-ISDN User Part (B-ISUP)
27、- Formats and codes. ITU Recommendation 4.2764 (1 995), Signalling System No. 7 B-ISDN User Part (B-ISUP) - Basic callprocedures. 1 Recommendation Q.2735.1 (06/97) i 11 ITU Recommendation 4.2955.1 (1997), Stage 3 description for communi of interest supplementmy services using B-ISDN Digital Subscrib
28、er Signalling system No. 2 (DSS 2): Closed User Group (CUG). CCITT Recommendation X. 180 (1988), Administrative arrangements for international Closed User Groups (CUGs). 123 1.3 Definitions and abbreviations 1.3.1 Definitions This Recommendation defines the following terms: 1.3.1.1 The supplementary
29、 service Closed User Group (CUG): enables users to form groups, to and from which access is restricted. A specific user may be a member of one or more CUGs. Members of a specific CUG can communicate among themselves, but not with users outside the group. Specific CUG members can have additional capa
30、bilities, that allow them to originate calls 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 receiving calls from other members of the CUG. 1.3.1.2 c
31、alling party number: is the network (e.g. E. 164) number of the calling party. 1.3.1.3 called party number: is the network (e.g. E.164) number of the called party. 1.3.1.4 CUG interlock code: is the code to uniquely identify a CUG inside the network. 1.3.2 Abbreviations This Recommendation uses the
32、following abbreviations: AE Application Entity AP Application Process ASE Application Service Element B-ISDN Broadband ISDN B-ISUP Broadband ISDN User Part cs 1 Capability Set One CUG Closed User Group DSS 2 ISDN Integrated Services Digital Network MTP Message Transfer Part NI Network Interface “I N
33、etwork Node Interface SACF Single Association Control Function SA0 Single Association Object Digital Subscriber Signalling System No. 2 1.4 Description A CUG is a group of users who may be members of one or several public networks; each ISDN member of a CUG is identified by an ISDN number. 2 Recomme
34、ndation 4.2735.1 (06/97) The Closed User Group (CUG) supplementary service enables a group of users to intercommunicate only among themselves or, as required, one or more users may be provided with incoming/outgoiiig access to users outside the group. The stage 1 definition of the CUG service is giv
35、en in Recommendation 1.255. The stage 2 description including network functions are given in clause l/Q.SS, and the stage 3 DSS 2 description is given in clause 114.2955. This stage 3 description of the CUG uses the broadband ISDN user part protocol as defined in Recommendations 4.2761 to 4.2764 and
36、 4.2730. The realization of the CUG service is done by the provision of interlock codes and is based on various validation checks at call Set-up, determining whether or not a requested call to or from a user having a CUG facility is allowed. In particular, a validation check is performed by veriing
37、that both the calling and the called parties belong to the CUG indicated by the interlock code. The guidelines for arrangements of international CUG and administration of international interlock codes are contained in Recommendation X. 180. The data for each CUG to which a user belongs can either be
38、 stored at the local exchange (decentralized administration of CUG data) or in a central location within the network (centralized administration of CUG data) to which the user is connected. 1.5 Specification model This Recommendation contains a description of the supplementary service CUG. The funct
39、ional architecture used is from a restructuring of the B-ISUP description. The structure is indicated in Figure 1 - 1. Ig T1162540-96 MTP 3 Figure 1-114.2735.1 - Specification model for B-ISUP CUG supplementary service 1.6 CUG application process functions 1.6.1 Primitive interface AP/SACF The close
40、d user group signalling functions in the application process uses services provided by the SACF primitive interface. Functions used are listed in Table 1 - 1. Recommendation 4.2735.1 (06/97) 3 STD-ITU-T RECMN Q.2735.1-ENGL 1777 qb257L Ob37bb 433 m Primitive name Set-up Table 1-VQ.2735.1- Primitives
41、between AP and SACF for CUG Types Requesthndication Release Parameter Closed user group information These primitives are also exchanged between the call control functions in the AP and the SACF for basic call. A parameter called closed user group information is used for the CUG service. This paramet
42、er is added to the Set - Up primitive. The parameter is mandatory. This is depicted in Table 1-2. Mandato/optional M Table 1-2lQ.2735.1- Parameter used for CUG in the Set-up requesthndication primitive Parameter Cause indicators Mandatory/optional M Also, the cause indicators parameter of the releas
43、e requestlindication primitive is used for the CUG supplementary service. The parameter is mandatory. This is depicted in Table 1-3. Result of validity check for CUG service request CUG call without outgoing access Table 1-3/Q.2735.1- Parameter used for CUG in the release requesthdication primitive
44、Actions Issue a Set-up request primitive. The interlock code of the selected CUG together with an indication for “outgoing access not allowed“ is included in the closed user group information parameter. 1.6.2 Procedures 1.6.2.1 Upon receipt of a request for CUG service, the AP shall check its validi
45、ty in conjunction with the access capabilities contained in the user profile. The various validity checks are described in Recommendation 4.2955.1. The result of that check then initiates frther actions by the AP as described in Table 1-4. Actions at the originating local exchange 4 Recommendation Q
46、.2735.1 (06/97) Table 1-4/Q.2735.1- AP actions resulting from validity check (concluded) Result of validity check for CUG service request Actions CUG call with outgoing access Call rejected Issue a Set-up request primitive. The interlock code of the selected CUG together with an indication for “outg
47、oing access allowed“ is included in the closed user group information parameter. No call Set-up initiated. Return an appropriate indication to the calling user. The presence of the closed user group information parameter in the Set-up request primitive is a request for the CUG service. 1.6.2.2 When
48、a transit exchange receives a Set-up indication on the incoming side containing information related to the CUG supplementary service, it shall include transparently all that information in the corresponding Set-up request issued on the outgoing side. Actions at the transit exchange 1.6.2.3 In the ca
49、se of an international CUG call, the gateway shall transparently pass on the information related to the CUG Supplementary service provided that the international interlock code assigned to the international CUG concerned is used in the national network at the gateway exchange. However, in the case where a national interlock code other than the applicable international interlock code is used within a national network, interlock code conversion is required at the gateway exchange. On receipt of a Set-up indication primitive containing the closed user group information
