1、 CCITT REC!N*d-85 72 W 4862571 0573124 781 W INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CO NSU LTATI V E COM MITTE E FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.85 STAGE 2 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES SECTION 1
2、 - CLOSED USER GROUP (CUG) SECTION 3 - MULTI-LEVEL PRECEDENCE AND PREEMPTION (MLPP) (rev.1) Modifications and addenda to: Recommendation Q.85 Geneva, 1992 CCITT RECMN*Q*B.5 92 m 4862593 0573325 838 m NTERNATIONAL TELECOMMUNICATION UN CCITT ON THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE CO
3、MMITTEE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.85 STAGE 2 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES SECTION 1 - CLOSED USER GROUP (CUG) SECTION 3 - MULTI-LEVEL PRECEDENCE AND PREEMPTION (MLPP) (rev.1) Modifications and addenda to: Recommendation Q.85 Geneva, 19
4、92 FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizi
5、ng telecommunications on a worldwide basis. The Plenary Assembly of CCIT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the proc
6、edure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation Q.8.5, $0 1 and 3 was prepared by Study Group Xi and was approved under the Resolution No. 2 procedure on the 4th of February 1992. CCIT NOTE In this Recommendation, the expression “Administration” is used for conciseness to
7、 indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1992 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 wr
8、iting from the ILFU. CCITT RECMN*6?-85 92 W 4862591 0573327 b90 Recommendation Q.85 STAGE 2 DESCRIPTION FOR COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES 1 Closed User Group (CUG) 1,l Scope This Recommendation defines the stage 2 of the integrated services digital network (ISDN) as provided by teleco
9、mmunications operators for the Closed User Group (CUG) supplementary service. Stage 2 identifies the functional capabilities and the information flows needed to support the service description. The Stage 2 description also identifies user operations not directly associated with a call (see Recommend
10、ation 1.130 i). This Recommendation is specified according to the methodology specified in Recommendation Q.65 2. This Recommendation does not formally describe the relationship between this supplementary service and the basic call, but where possible, this information is included for guidance. In a
11、ddition, this Recommendation does not specify the requirements where the service is provided to the user via a private ISDN. This Recommendation does not specify the requirements for the allocation of defined functional entities within a private ISDN, it does however, define which functional entitie
12、s may be allocated to a private ISDN. This Recommendation does not specify the additional requirements where the service is provided to the user via a telecommunications network that is not an ISDN. The CUG supplementary service enables users to form groups to and from which access is restricted. A
13、specific user may be a member of one or more closed user groups. Members of a specific Closed User Group can communicate among themselves but not, in general, with users outside the group. The CUG supplementary service is applicable to all telecommunication services. This Recommendation is applicabl
14、e to the stage 3 Recommendations for the ISDN CUG supplementary service. The term “stage 3” is also defined in Recommendation 1.130 i. 1.2 References This Recommendation incorporates by dated or undated reference, provisions from other publications. These references are cited at the appropriate plac
15、es in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of any .of these publications apply to this Recommendation only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referr
16、e to applies. ri1 CCITT Rec. 1.130 - Methods for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN, 1988. E21 CCITT Rec. Q.65 - Stage 2 of the method for the characterization of services supported by an ISDN, 1988. 31 CCITT Rec. 1.112 - Vocab
17、ulary of terms for ISDNs, 1988. 41 CCIT Rec. Q.71) - ISDN 64 kbith circuit mode switched bearer services, 1988. 51 CCITT Rec. 1.255.1 - Closed User Group. 1 Recommendation 4.71 will be submitted for approval at the CCIT Plenary Assembly in March, 1993. Recomenda tion Q.85 1 CCITT RECNN*d-85 92 48625
18、93 0573328 527 CCIT Rec. 1.210 - Principles of telecommunication services supported by an ISDN and the means used to describe them, 1988. CC1- Rec. Q.950 - Supplementary services protocols - Structure and general principles. CCITT Rec. Q.93 1 .- ISDN user-network interface layer 3 specijcation for b
19、asic call control. CCITT Rec. Q.763.- Specifications of Signalling System No. 7 - Formats and codes. Definitions For the purposes of this Recommendation, the following definitions apply: Integrated services digital network (ISDN) See Recommendation 1.1 12 3, $ 2.3, definition 308. Service, telecommu
20、nications service See Recommendation 1.1 12 3, $2.2, definition 201. Supplementary service See Recommendation 1.210 6, $ 2.4. Closed User Group Grouping of users with common avaiiabiiity requirements. preferential CUG A preferential Closed User Group is the nominate8 default group to be used u-en no
21、 Closed User Group or explicit outgoing access request is received by the network. incoming access An arrangement which allows a member of a Closed User Group to receive calls from outside the Closed User Group. outgoing access An arrangement which allows a member of a Closed User Group to place cal
22、ls outside the Closed User Group. incoming calls barred within a Closed User Group An access restriction that prevents a Closed User Group member from receiving cds from other members of that group. outgoing calls barred within a Closed User Group An access restriction that prevents a Closed User Gr
23、oup member from placing cas to other members of that group. Closed User Group call A cail is a cail which is restricted to a pre-defined group of users. CUG domain An area of common CUG interlock codes. 2 Recommendation Q.85 CCITT RECMN*Q.85 92 48b2.591 0573129 463 W The domain internal CUG interloc
24、k codes need not be released via the boundary of the domain. A Closed User Group application may span over several domains. Both domains shall treat the other domains Closed User Group as a single member of its own Closed User Group. 1.4 Symbols and abbreviations cc CCA CUG DB FE FEA LA ICB IIC ISDN
25、 LE OA OCB OIC PCUG PN TE Call Control Call control agent Closed User Group Data base Functional entity Functional entity actions Incoming access Incoming caiis barred Incoming international centre Integrated services digitai network Local exchange Outgoing access Outgoing calls barred Outgoing inte
26、rnational centre Preferential CUG Private network Terminal equipment 1.5 Description The general description of the CUG supplementary service is specified in Recommendation 1.255.1 5. 1.6 Derivation of the functional model 1.6.1 Functional model description The functional model for the CUG supplemen
27、tary service shall be as shown in Figures 1-UQ.85 and 1-2/Q.85. The functional model for the application of the CUG supplementary service within a single CUG domain shall be as shown in Figure 1-UQ.85. The expanded functional model used for interworking between CUG domains shall be as shown in Figur
28、e 1-2/Q.85. Recommendation Q.85 3 CCITT RECMNUd-85 92 W 4862593 0573330 385 FE3 FE5 ld re FE6 rc FE4 b FE2 a FEI T112.5690-90 FIGURE 1-1/Q.85 T Domain A Domain B * ra rb Y FE1 FE2 FE4 I I I Domain C FIGURE 1 -2/Q. 85 Expanded functional model 4 Recommendation Q.85 CCITT RECMN*d-85 92 4862591 0573L3L
29、 OLL FE1 CCA 1.6.2 Description of thejinctional entities The functional entities for the CUG supplementary service shall be as shown below: FE1 Originating CUG agent FE2 Outgoing CUG determination FE3 Outgoing CUG control FE4 Incoming CUG determination FE5 Incoming CUG control FE6 Destination CUG ag
30、ent Relationship with a basic service The relationship of the functional model for the CUG supplementary service with a basic call may be as 1.6.3 shown in Figure 1-3/Q.85. FE6 lb IC FE2 FE4 ra ri r2 CCA r3 - cc r2 cc cc T1131380-91 FIGURE 1-3/Q.85 Relationship of the model to a basic call 1.7 Infor
31、mationflows 1.7.1 Information flow diagrams The information flows for the CUG supplementary services shall be as shown in Figures 1-4/Q.85 to 1-8Q.85. Figures 1-YQ.85 and 1WQ.85 show a portion of the flows appropriate to a call across multiple domains. Recommendation Q.85 5 CCITT RECMN*Q.85 92 48625
32、93 0573332 T58 W - I - T I I I I I I I Id I I I I 6 Recommendation Q.85 CCITT RECMN*Q.85 92 m 4862593 0573333 994 m Ia rd FEI - FE2 - T1131400-91 FE3 Note - Call to this point is covered in Figure 1-4/Q.85. 21 I INFORM J req. 910 (Note) . 91 1 ) lg;$jj ) ) INFORM1 req. ind. 920 ENQUIRY1 ) req. ind.
33、ENQUIRY 1 I- 231 SETUP I req. ind. INFORM 1 req. ind. INFORM1 REJECT - 920 921 923 924 - req. ind. T1131430-91 Note 1 - Call to this point is covered in Figure 1-4/4235. Note 2 - Depending on the progress of the basic caii INFORM 1 will be sent simultaneously with the appropriate basic call clearing
34、 information flow. FIGURE 1-8/Q.85 Chaining of CUG domains (Unsuccessful CUG caiis between different CUG domains showing information flows across relationship 4. according to the functional model in Figure 1-2/Q.85.) 1.1.2 1.7.2.1 Relationship a 1 J.2.1.1 Definition of individual information flows C
35、ontents of INFORM 1 The contents of INFORM 1 shall be as in Table 1-UQ.85. INFORM 1 is an optional information flow. TABLE 1-UQ.85 INFORM 1 contents Name CUG index OA indication 1.7.2.1.2 Contents of INFORM 1 REJECT req. ind. optional optional Allowed value ON OFF The contents of INFORM 1 REJECT sud
36、l be as in Table 1-2/Q.85. Recommendation Q.85 9 CCITT REClN*d*AS 92 H 4Ab259L 0.573336 bT3 H TABLE 1-214.85 INFORM 1 REJECT contents Name req. ind. Mowed value CUG specific reason Mandatory (Note) Note - For allowed values, see Recommendation Q.950 7. 1.7.2.2 Relationship rb 1.7.2.2.1 Contents of I
37、NFORM 2 The contents of INFORM 2 shall be as in Table I-YQ.85. INFORM 2 at 6 is au optional information flow. TABLE 1-314.85 INFORM 2 contents Name req. ind. Mowed value CUG interlock code Mandatory (Note 1) (Note 2) OA indication Optional ON OFF Note 1 - Where the INFORM 2 information flow crosses
38、an international gateway, the CUG interlock code shall be an international CUG interlock code. Note 2 -As specified in 0 3.13 of Recommendation Q.763 191. 1.7.2.2.2 Contents of INFORM 2 REJECT The contents of INFORM 2 REJECT shaii be as in Table 1-4/Q.85. TABLE 1-4/Q.85 INFORM 2 REJECT contents Name
39、 req. ind. Allowed value CUG specific reason Mandatory (Note) Note - For allowed values, see Recommendation Q.950 7. 1.7.2.3 Relationship r, INFORM 1, see 0 1.7.2.1.1. INFORM 1 REJ, see Q 1.7.2.1.2. 10 Recommendation Q.85 CCITT RECMN*l-85 92 W 4862593 0573337 53T E Name Non-CUG 1.7.2.4 Relationship
40、rd 1.7.2.4.1 Contents of ENQUIRY 1 The contents of ENQUIRY 1 shall be as in Tables 1-YQ.85 and 1-6/Q.85. resp. conf. Mowed value Optional Note 1 - FE2 may send the ENQUIRY to FE3 as soon as sufficient addressing information to identiy the access can be included. Note 2 - The values are derived from
41、the original call Set-up request. For allowed values see Recommendation Q.931 SI. CUG interlock code Reject reason The result shall be one of the following values: optional (Note 3) optional (Note 2) optional I (Notes 3 and 4) CUG interlock code and OA indication Note 1 -The information elements abo
42、ve shall be mutually exclusive. Note 2 - For allowed values see Recommendation Q.950 7. Note 3 - As specified in 0 3.13 of Recommendation 4.763 9. Note 4 -National option. 1.7.2.5 Relationship e 1.7.2.5.1 Contents of ENQUIRY 2 The contents of ENQUIRY 2 shall be as in Tables 1-7/Q.85 and 14VQ.85, Rec
43、ommendation Q.85 11 CCITT RECMN*kQ*85 72 4862571 0573138 476 9 TABLE 1-7/Q.85 ENQURY 2 contents Allowed value Name req. ind Called party number (Note 2) Mandatory (Note 3) Basic service I Mandatory Optional I (Note4) I I CUG interlock code (Note 1) Non-CUG Optional OA indication (Note I) Optional (N
44、ote 4) Note 1 -A combination CUG interlock code with OA indication shail be supported. Note 2 - FE4 may send the ENQUIRY to FE5 as soon as sufficient addressing information to identify the access can be included Note 3 - The values are derived from the received Cali set-up request. For allowed value
45、s see Recommendation 4.93 1 81. Note 4 -As specified in $ 3.13 of Recommendation Q.763 9. The result shall be one of the following values: TABLE 1-814.85 I I Allowed value Name resp. conf. I I I Non-CUG I Optional I I I CUGindex I Optional OA indication Optional Reject reason Optional (Note 2) Note
46、I - resp. conf. conveying the combination CUG index with OA indication may be supported as a national option. Note 2 - For allowed values, see Recommendation Q.950 7. I .7.2.6 Relationship ry This relationship appears to be an r, relationship to FE4 and an ia relationship to FE2. INFORM 1, see 4 1.7
47、.2.1.1. INFORM 1 REJECT, see 4 1.7.2.1.2. At this relationship the CUG index is mandatory. 12 Recommendation Q.85 CCITT RECMN*i INFORM 1 -t:FE2 (Note 1) (Note 2) -I- - 922 req. ind. (Note 2) FIGURE l-lO/Q.SS (sheet 1 of 2) CUG, FE2 14 Recommendation Q.85 CCITT RECMN*d.B5 72 m 4862573 0573343 TbO m I
48、nseri reject reason into basic call clearing information flows Notes relative to Figure 1-lOlQ.85 (sheer 1 of 2): Note 1 - r, , FE1 from a user end equipment - ry from another CUG domain. Nofe 2 - This INFORM 2 req. ind. shall be sent simultaneously with the basic call SETUP req. ind. Nofe 3 - On a
49、call received from an end user equipment CUGS, CUG6, CUG7 and CUGI break the basic call between connector S2/1 and S2/2 of Recommendation Q.71 4. On a call received from another CUG domain of aprivate ISDN, CUGS, CUG6, CUG7 and CUGI break the basic call during CC state “IDLE“ during FEA 261 see Figure 2-1WQ.71 4 (sheet 1 of 7) by following the YES branch of the decision “successful” and prior to sending “SETUP ind.”. The analysis of MSN or DDI shall be performed prior to the invocation of CUG. CUG7 i
