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q81_3sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.81.3
Title : Stage 2 description for number identification supplementary
services
Study Group : XI - Switching and Signalling
Version : Revised
Date of adoption : 1991
Notes :
CALLING LINE IDENTIFICATION PRESENTATION (CLIP) AND CALLING LINE
IDENTIFICATION RESTRICTION (CLIR)
Recommendation Q.81.3 defines the stage 2 of the integrated services
digital network (ISDN) as provided by the telecommunications operators
for the Calling Line Identification Presentation (CLIP) and Calling
Line Identification Restriction (CLIR) supplementary services. 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.81.3 is defined according to the methodology
specified in Recommendation Q.65.
Recommendation Q.81.3 does not formally describe the relationship
between these supplementary services and the basic call but, where
possible, this information is included for guidance.
In addition, Recommendation Q.81.3 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.81.3 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.81.3 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The CLIP supplementary service provides the called party with the
possibility to receive identification of the calling party.
The CLIR supplementary service enables the calling party to prevent
presentation of its ISDN number to the called party.
The CLIP and CLIR supplementary services are applicable to all
telecommunication services.
Recommendation Q.81.3 is applicable to the stage 3 Recommendations for
the ISDN CLIP and CLIR supplementary services, as 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).