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q85_3sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.85.3
Title : Stage 2 description for community of interest supplementary
services
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
MULTI-LEVEL PRECEDENCE AND PREEMPTION (MLPP)
Recommendation Q.85.3 defines the stage 2 for the Multi-Level
Precedence and Preemption (MLPP) supplementary service of the
integrated service digital network (ISDN) as provided by public
telecommunications operators. 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.85.3 is defined according to the methodology
specified in Recommendation Q.65.
Recommendation Q.85.3 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.85.3 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.85.3 does not specify the allocation of defined
functional entities within a private ISDN; however, it does define
which functional entities may be allocated to a private ISDN.
Recommendation Q.85.3 does not specify the additional requirements
where the service is provided to the user via a telecommunication
network that is not an ISDN.
Recommendation Q.85.3 is applicable to the stage 3 Recommendations
for the ISDN MLPP supplementary service. The term "stage 3" is defined
in Recommendation I.130.
MLPP service is defined in Recommendation I.255.3.
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).