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q83_1sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.83.1
Title : Stage 2 description for call completion supplementary services
Study Group : XI - Switching and Signalling
Version : Revised
Date of adoption : 1991
Notes :
CALL WAITING (CW)
Recommendation Q.83.1 defines the stage 2 of the integrated services
digital network (ISDN) as provided for the call waiting (CW)
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 Rec. I.130).
Recommendation Q.83.1 is specified according to the methodology
specified in Recommendation Q.65 [2].
Recommendation Q.83.1 does not formally describe the relationship
between this supplementary service and the basic call but, where
possible, the information is included for guidance.
In addition, Recommendation Q.83.1 does not specify the requirements
where the service is provided to the user via a private ISDN. This
Recommendation 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.83.1 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The CW supplementary service permits a subscriber to be notified of an
incoming call (as per basic call procedures) with an indication that
no interface information channel is available. The user then has the
choice of accepting, rejecting or ignoring the waiting call (as per
basic call procedures).
The CW supplementary service is considered meaningful when applied to
the telephony teleservice and the speech and 3.1 kHz audio bearer
services. Furthermore, it may also be meaningful when applied to
other services.
Recommendation Q.83.1 is applicable to the stage 3 Recommendations
for the ISDN CW 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).