ETSI ETS 300 518 ed.1 (1994-09)

European digital cellular telecommunications system (Phase 2); Closed User Group (CUG) supplementary services; Stage 1 (GSM 02.85)

DE/SMG-010285P

Evropski digitalni celični telekomunikacijski sistem (faza 2) – Dopolnilna storitev: zaprta skupina uporabnikov (CUG) – Stopnja 1 (GSM 02.85)

General Information

• Status: Published
• Publication Date: 12-Sep-1994
• Technical Committee: SMG 1 - Services & Facilities
• Current Stage: 12 - Completion
• Due Date: 03-Oct-1994
• Completion Date: 13-Sep-1994
• Ref Project: SIST ETS 300 518 E1:2003 - European digital cellular telecommunications system (Phase 2); Closed User Group (CUG) supplementary services; Stage 1 (GSM 02.85)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 518 E1:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±'RSROQLOQDVWRULWHY
]DSUWDVNXSLQDXSRUDEQLNRY&8*±6WRSQMD*60
European digital cellular telecommunications system (Phase 2); Closed User Group
(CUG) supplementary services; Stage 1 (GSM 02.85)
Ta slovenski standard je istoveten z: ETS 300 518 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 518 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 518 E1:2003

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SIST ETS 300 518 E1:2003
EUROPEAN ETS 300 518
TELECOMMUNICATION September 1994
STANDARD
Source: ETSI TC-SMG Reference: GSM 02.85
ICS: 33.060.30
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Closed User Group (CUG) supplementary services - Stage 1
(GSM 02.85)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box

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ETS 300 518: September 1994 (GSM 02.85 version 4.2.5)
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword.5
0 Community of interest supplementary services.7
0.1 Scope .7
0.2 Normative references .7
0.3 Definitions and abbreviations.7
1 Closed User Group (CUG) .7
1.1 Definition .7
1.2 Description .7
1.2.1 Description .7
1.2.2 Applicability to telecommunication services.8
1.2.3 Terminology.8
1.3 Normal procedures with successful outcome . 8
1.3.1 Provision.8
1.3.2 Withdrawal .9
1.3.5 Activation. 9
1.3.6 Deactivation.9
1.3.7 Invocation .9
1.3.8 Normal operation with successful outcome .9
1.3.8.1 Mobile originating calls. 10
1.3.8.1.1 A user with no preferential CUG and
no OA capability. 10
1.3.8.1.2 A user with a preferential CUG but no
OA capability . 10
1.3.8.1.3 A user with the OA capability but no
preferential CUG . 10
1.3.8.1.4 A user with a preferential CUG and the
OA capability . 10
1.3.8.1.5 A user not subscribing to the CUG
supplementary service. 11
1.3.8.2 Mobile terminating calls. 11
1.3.8.2.1 CUG call with no OA indication. 11
1.3.8.2.2 CUG call with OA indication. 11
1.3.8.2.3 Normal call. 11
1.4 Exceptional procedures or unsuccessful outcome . 11
1.4.1 Exceptional operation or unsuccessful outcome . 11
1.4.10 Roaming into networks not supporting CUG. 12
1.5 Alternate procedures. 12
1.6 Interactions with other supplementary services. 12
1.6.82.1 Call forwarding unconditional. 12
1.6.82.2 Call forwarding on mobile subscriber busy. 13
1.6.82.3 Call forwarding on no reply. 13
1.6.82.4 Call forwarding on mobile subscriber not reachable. 13
1.6.83.1 Call waiting. 13
1.6.84.1 Multi-party service. 13
1.6.88 Call restriction supplementary services. 13
1.7 Interworking considerations. 13
Annex 1 (normative): General subscription options (Per Subscriber). 15
Annex 2 (normative): Originating GSM PLMN network actions on call requests on the calling user's
side . 16

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Annex 3 (normative): Terminating GSM PLMN network actions.17
Annex 4 (normative): CUG interaction with the call forwarding supplementary services .18
History .19

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ETS 300 518: September 1994 (GSM 02.85 version 4.2.5)
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).
This ETS describes Closed User Group (CUG) supplementary services within the European digital cellular
telecommunications system (Phase 2) and corresponds to GSM technical specification GSM 02.85 version
4.2.5.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE rules.
Reference is made within this ETS to GSM-TSs (NOTE).
NOTE: TC-SMG has produced documents which give the technical specifications for the
implementation of the European digital cellular telecommunications system. Historically,
these documents have been identified as GSM Technical Specifications (GSM-TSs).
These TSs may have subsequently become I-ETSs (Phase 1), or ETSs (Phase 2),
whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial
reasons, still referred to in GSM ETSs.

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Blank page

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0 Community of interest supplementary services
0.1 Scope
This specification describes the supplementary services belonging to the group COMMUNITY OF
INTEREST SUPPLEMENTARY SERVICES.
The general aspects, including definitions and recommended provision, of the description of the GSM
supplementary services are given in specification GSM 02.04.
The group of COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES includes one supplementary
service:
- Closed user group (section 1).
0.2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places 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 ETS only when incorporated in it by amendment or revision. For undated references, the latest
edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunication system
(Phase 2); Definitions, abbreviations and acronyms".
[2] GSM 02.04 (ETS 300 503): "European digital cellular telecommunication system
(Phase 2); General on supplementary services".
[3] GSM 03.03 (ETS 300 523): "European digital cellular telecommunication system
(Phase 2); Numbering, addressing and identification".
[4] CCITT Recommendation X.121: "International numbering plan for public data
networks".
[5] CCITT Recommendation X.180: "Administrative arrangements for closed user
groups (CUGs)".
0.3 Definitions and abbreviations
Abbreviations used in this specification are listed in GSM 01.04.
1 Closed User Group (CUG)
1.1 Definition
The Closed User Group (CUG) supplementary service enables subscribers, connected to a PLMN and
possibly also other networks, to form closed user groups (CUGs) 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 each other but not, in general, with users outside the group.
The ability to set up emergency calls remains unaffected.
1.2 Description
1.2.1 Description
An ISDN/MSISDN number shall identify each member of a CUG.
A CUG shall be defined for one or more basic service groups.

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CUG members can have additional capabilities that allow them to originate calls outside the group, and/or
to receive calls from outside the group. 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.
CUG shall remain unaffected when members roam to PLMNs supporting CUG. Roaming subscribers must
have the same CUG facilities on the roamed-to PLMN as on the Home PLMN.
When roaming to networks not supporting CUG, the CUG restrictions must be enforced. (However, where
possible, the CUG facilities should be supported, see section 1.4.10.)
Each individual subscriber may be a member of a maximum of 10 CUGs.
1.2.2 Applicability to telecommunication services
The CUG supplementary service is applicable to all telecommunication services, except Emergency calls,
SMS, dedicated PAD access and dedicated Packet access.
1.2.3 Terminology
MSISDN: a number conforming to the numbering plan and structure specified in GSM Specification 03.03.
CUG member: a user who has subscribed to the CUG supplementary service and is one of the users in the
group formed by a particular CUG.
CUG index: a value assigned by the network to identify a CUG.
CUG interlock code (IC): is used by the network (not by the MS) to identify CUG membership.
Preferential CUG: a preferential CUG, which can be specified for each basic service group, is the
nominated default CUG to be used when no explicit CUG index is received by the network.
Suppress preferential CUG: a user action to prohibit the use of the preferential CUG, on a per call basis.
Incoming Access (IA): an arrangement which allows a member of a CUG to receive calls from outside the
CUG.
Outgoing Access (OA): an arrangement which allows a member of a CUG to place calls outside the CUG.
Suppress OA: a user action to prohibit the use of the OA subscription option, on a per call basis.
Incoming calls barred within a CUG (icb): an access restriction that prevents a CUG member from
receiving calls from other members of that group.
Outgoing calls barred within a CUG (ocb): an access restriction that prevents a CUG member from placing
calls to other members of that group.
CUG calls: a CUG call is a call which is restricted to a pre-defined group of users.
1.3 Normal procedures with successful outcome
1.3.1 Provision
The CUG supplementary service shall be provided after prior arrangement with the service provider. At
provision subscription options should be selected by the served mobile subscriber.
A user may be a member of several CUGs. The service provider defines the number of CUGs, up to the
maximum stated in section 1.2.1, which can be allocated to an individual subscriber.

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The user shall choose one of the following subscription options for each basic service group applied to the
CUG supplementary service. This subscription option may be provisioned on a per basic service group
basis or for all basic services:
- CUG calls only;
- CUG with incoming access, i.e can also receive calls, which are not subject to CUG
restrictions;
- CUG with outgoing access, i.e. can also make calls, which are not subject to CUG
restrictions;
- CUG with incoming and outgoing access, i.e. can also make and receive calls, which are not
subject to CUG restrictions.
A user may subscribe to one of two additional restrictions applying for each particular CUG:
- incoming calls barred within a CUG;
- outgoing calls barred within a CUG.
The network shall provide a subscription option in order to enable the user to specify a preferential CUG,
for each basic service group included in at least one of the CUG(s). The user can request that no
preferential CUG exists, or that a particular one of her CUGs (or the only one if a single CUG applies) is
used as a preferential CUG for the particular basic service group.
If a user has the subscription option outgoing calls barred within a CUG, it is not allowed to specify that
particular CUG as a preferential CUG.
The subscription options are shown in Annex 1.
The CUG indices shall be allocated by prior arrangement with the service provider.
The choice of preferential CUG(s) shall be alterable only by service provider action upon request by the
served user.
1.3.2 Withdrawal
Withdrawal of the CUG supplementary service, membership of one or more CUGs, will be by the action of
the service provider, at the request of the subscriber or CUG management, or for administrative reasons.
1.3.5 Activation
The CUG supplementary service will be activated by the service provider as a result of provision.
1.3.6 Deactivation
The CUG supplementary service will be deactivated by the service provider as a result of withdrawal.
1.3.7 Invocation
Normal call setup procedures shall apply to calls with the CUG supplementary service.
1.3.8 Normal operation with successful outcome
A user having neither the restriction of incoming calls barred within a CUG, nor the restriction of outgoing
calls barred within a CUG can make calls to, and receive calls from, members of those CUGs of which the
user is a member.
Upon receipt of a call setup attempt to or from a CUG subscriber the network shall check its validity in
conjunction with the access capabilities subscribed to.
On successful validation of a CUG call setup attempt the network shall attempt to establish the call to the
required destination.

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1.3.8.1 Mobile originating calls
When originating a call, the calling user may specify a CUG index to indicate that service to a particular
CUG is required. If no CUG index is given then the preferential CUG (if specified) is used by the network.
The Outgoing Access (OA) capability allows CUG subscribers to make outgoing calls, which are not
subject to CUG restrictions.
If a user, subscribing to the CUG supplementary service, originates a call and enters a request for
suppression of both a preferential CUG and of the OA capability but does not enter a CUG index, the call
shall be rejected.
If a user, subscribing to the CUG supplementary service and having the OA capability, originates a call and
enters a CUG index (without suppressing the OA capability), while having the restriction of outgoing calls
barred within that CUG, the call shall be established without any CUG information i.e. as a normal call.
The originating GSM PLMN network actions are illustrated in Annex 2.
As a network option, the network may signal towards the calling user the CUG index in use for the current
call, if this can be determined by the network.
1.3.8.1.1 A user with no preferential CUG and no OA capability
If a user, subscribing to the CUG supplementary service, who has no preferential CUG and no OA
capability, originates a call and enters a CUG index (and possibly requests suppression of a preferential
CUG and/or the OA capability) the call shall be established using the CUG index provided. If no CUG index
is entered the call shall be rejected.
1.3.8.1.2 A user with a preferential CUG but no OA capability
If a user, subscribing to the CUG supplementary service, who has a preferential CUG but no OA capability,
originates a call and enters no
...