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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.84.2
Title : Stage 2 Description for multiparty supplementary services
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
THREE-PARTY SERVICE (3PTY)
Recommendation Q.84.2 defines the stage 2 of the Three-Party
supplementary service. Stage 2 identifies the functional capabilities
and the information flows needed to support the service as described
in stage 1. The stage 2 description also identifies user operations
not directly associated with a call (see Recommendation I.130).
Recommendation Q.84.2 is specified according to the methodology
specified in Recommendation Q.65.
In addition, Recommendation Q.84.2 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.84.2 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The Three-Party supplementary service enables a user who is involved
in, at least, two calls (on active call and at least on call on hold)
to join the two calls together into a 3-way conversation, i.e. a
simultaneous communication between the served user and two other
parties.
This supplementary service is not applicable to non-voice services.
Recommendation Q.84.2 is applicable to the stage 3 standards for the
integrated services digital network.
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).