home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Internet Standards
/
CD2.mdf
/
ccitt
/
1992
/
q
/
q83_2sum.txt
< prev
next >
Wrap
Text File
|
1994-11-04
|
2KB
|
60 lines
INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.83.2
Title : Stage 2 description for call completion supplementary services
Study Group : XI - Switching and Signalling
Version : Revised
Date of adoption : 1992
Notes :
CALL HOLD
Recommendation Q.83.2 defines the stage 2 of the Call Hold (CH)
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.83.2 is specified according to the methodology
specified in Recommendation Q.65.
In addition, Recommendation Q.83.2 does not specify the requirements
where the service is provided to the user via a private ISDN.
Recommendation Q.83.2 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.83.2 does not specify the additional requirements
where the service is provided to the user via a telecommunications
network that is not an ISDN.
The Call Hold service allows a user to interrupt communications on an
existing call/connection and then subsequently, if desired,
re-establish communications. A B-channel may or may not be reserved
after the communication is interrupted to allow the origination or
possible termination of other calls. Reservation must be provided by
the service provider as a user option. The Call Hold service includes
the retrieve operation which re-establishes communication on a
B-channel between the served user and the held party.
This supplementary service is not applicable to non-voice services.
Recommendation Q.83.2 is applicable to the stage 3 Recommendations
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).