1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 8 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU05“,)#G0G0$!4!G0G0.%47/2+3!$-).)342!4)6%G0G0!22!.%-%.43!$-).)342!4)6%G0G0!22!.%-%.43G0G0 amended at Melbourne, 1988)The CCITT,bearing in mind(a) the introduction of international CUGs in public networks that
2、provide packet-switched and circuits-witched data transmission services;(b) the need to standardize a scheme for international CUG numbers;(c) the need to standardize administrative procedures for allocation of international CUG numbers and theestablishment of international CUGs,unanimously recommen
3、ds the following1 One subscriber, hereafter called the “responsible subscriber“, shall clearly be allocated the responsibility for allorganizational matters relating to an international CUG. The responsible subscriber shall be nominated by the subscribersintending to form an international CUG (see N
4、ote 1).2 The Administration of the country housing this “responsible subscriber“ (hereafter called the “coordinatingAdministration“) shall act as the controlling and coordinating Administration for that CUG and shall carry out thediscussions with the responsible subscriber about changes to the CUG.
5、The coordinating Administration shall also beresponsible for allocating the international CUG number (ICN) and for issuing the necessary information to otherAdministrations involved in the CUG.3 If the public network is a data network, the DNIC or DCC used for the construction of the ICN would be on
6、eproper to the coordinating Administration. If the public network is ISDN, the INIC (see Note 5) would be used for theconstruction of the ICN. If the responsible subscriber changes his country of residence, the ICN shall be changed inaccordance with the DNIC, DCC or INIC of the new coordinating Admi
7、nistration.4 The ICN allocated by the coordinating Administration shall be retained for the period of existence of theinternational CUG even if the location of members of the CUG changes, as long as the responsible subscriber is locatedwithin the area of the coordinating Administration.5 The ICN wil
8、l be represented by two decimal numbers A/B, where A is the DNIC, DCC (plus one digit) or INICin accordance with 3 above, and B is a 1-5 digit number (see Note 2).6 In order to allow efficient conversion of CUG information, where required, for international CUG calls,restrictions on allocation of th
9、e ICNs used by each coordinating Administration have to be applied. Provisionally thefollowing guidelines should apply:i) each coordinating Administration should allocate the ICNs to international CUGs in sequence withincertain range of the available total range of ICNs;ii) information should be sen
10、t regularly to the Administrations concerned about the size and allocation of therange used for ICNs in i) above;iii) the size of the range used should not be bigger than necessary for the operation of the network.7 The following procedures should apply for the interchange of information between Adm
11、inistrations andsubscribers of an international CUG. Where a subscriber belongs to more than one international CUG, the procedures inthis Recommendation must be applied separately for each international CUG.2 Fascicle VIII.3 - Rec. X.1807.1 A subscriber applying for membership of an international CU
12、G shall apply to his own Administration usingstandard application procedures. He should supply full details of the responsible subscriber (see Note 3).7.2 The Administration receiving the request should pass details in a standard format to the coordinatingAdministration as indicated in Annex A.7.3 T
13、he coordinating Administration will then verify with the responsible subscriber whether the application can bepermitted and, if acceptable, will inform the applying subscribers Administration of the ICN allocated for that particularCUG.7.4 The Administration of the applying subscriber shall inform t
14、he coordinating Administration when the applyingsubscriber is connected.7.5 The existing member Administrations of an international CUG shall be informed by the coordinatingAdministration when a subscriber of a new Administration has become a member of that CUG.7.6 Changes in membership of an intern
15、ational CUG or cessation of a CUG shall similarly be arranged between theresponsible subscriber and the coordinating Administration following individual applications from the members of theCUG concerned.7.7 The coordinating Administration shall, on request from the responsible subscriber or one of t
16、he memberAdministrations of an international CUG, supply information (print out) of all subscribers in that particular CUG. Theapproval of the responsible subscriber is needed in the latter case (see Note 4).8 The fact that the applying subscriber may be a member of other CUGs or may wish to have ou
17、tgoing orincoming access in addition to the CUG facility is of no relevance to the administrative procedures contained in thisRecommendation.Note 1 - It is assumed that in a CUG of an international organization the headquarters branch probably will bethe responsible subscriber.Note 2 - According to
18、Recommendation X.300, the value B should not be greater than 216- 1 = 65 535.Note 3 - To simplify the administrative arrangements, the procedures in 6.1 and 6.2 should be followed alsoin the case where the applying subscriber is a branch of an international organization and another branch of thatorg
19、anization is the responsible subscriber.Note 4 - Legal, or other, considerations may preclude some coordinating Administrations from supplying suchinformation at the request of other member Administrations of an international CUG.Note 5 - For ISDN identification, a four-digit field ISDN Network Iden
20、tification Code (INIC) is used. INICconsists of 0 + E.164 country code + national network digit(s). In order to identify additional ISDNs, some countriesmay also use 9 + E.164 country code + national network digit(s). Alternative ways of ISDN network identification arefor further study.Fascicle VIII
21、3 - Rec. X.180 3ANNEX A(to Recommendation X.180)The format and information to be passed to the coordinating Administration following an application from asubscriber to join or cease membership of an international closed user group is as follows:1 Application to join/cease membership of an internati
22、onal closed user group (CUG) on a public network has beenreceived from:FirmAddressCountryPublic Network No.Date of application2 The responsible subscriber for this international CUG is:FirmAddressPublic Network No.3 The responsible subscribers international CUG number (ICN)4 The applying subscriber requires the following facility (if any):- incoming calls barred within the CUG,- outgoing calls barred within the CUG.
