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q85_1sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.85.1
Title : Stage 2 description for community of interest supplementary
services
Study Group : XI - Switching and Signalling
Version : Revised
Date of adoption : 1992
Notes :
CLOSED USER GROUP (CUG)
Recommendation Q.85.1 defines the stage 2 of the integrated services
digital network (ISDN) as provided by telecommunications 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 Recommendation I.130).
Recommendation Q.85.1 is specified according to the methodology
specified in Recommendation Q.65.
Recommendation Q.85.1 does not formally describe the relationship
between this supplementary service and the basic call, but where
possible, this information is included for guidance.
In addition, Recommendation Q.85.1 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.85.1 does not specify the requirements for the
allocation of defined functional entities within a private ISDN, it
does however, define which functional entities may be allocated to
a private ISDN.
Recommendation Q.85.1 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 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.
Recommendation Q.85.1 is applicable to the stage 3 Recommendations for
the ISDN CUG supplementary service. The term "stage 3" is also
defined in Recommendation I.130.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).