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q81_5sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.81.5
Title : Stage 2 description for number identification supplementary
services
Study Group : XI - Switching and Signalling
Version : Revised
Date of adoption : 1991
Notes :
CONNECTED LINE IDENTIFICATION, PRESENTATION AND RESTRICTION
(COLP AND COLR)
Recommendation Q.81.5 defines the stage 2 of the integrated services
digital network (ISDN) as provided by public telecommunications
operators for the Connected Line Identification Presentation (COLP)
and Connected Line Identification Restriction (COLR) 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.81.5 is defined according to the methodology
specified in Recommendation Q.65.
Recommendation Q.81.5 does not formally describe the relation between
these supplementary services and the basic call but, where possible,
this information is included for guidance.
In addition, Recommendation Q.81.5 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.81.5 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.81.5 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The COLP supplementary service provides the calling party with the
possibility to receive identification of the connected party.
The COLR supplementary service enables the connected party to prevent
presentation of its ISDN number to the calling party.
The COLP and COLR supplementary services are applicable to all
telecommunication services.
Recommendation Q.81.5 is applicable to the stage 3 standards for the
ISDN COLP and COLR supplementary services. The term "stage 3" is
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).