home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Internet Standards
/
CD2.mdf
/
ccitt
/
1992
/
q
/
q953_1s.txt
< prev
next >
Wrap
Text File
|
1994-11-04
|
1KB
|
43 lines
INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : Q.953.1
Title : Stage 3 description for call completion supplementary services
using DSS 1
Study Group : XI - Switching and Signalling
Version : New
Date of adoption : 1992
Notes :
CALL WAITING (CW)
The Call Waiting (CW) supplementary service permits a subscriber to be
notified of an incoming call (as per basic call procedures) with an
indication that no information channel is available. The user then has
the choice of accepting, rejecting, or ignoring the waiting call.
The CW supplementary service allows a subscriber to be notified of an
incoming call when a B-channel is not available. The notification is
done out-of-band following basic call procedures.
The CW supplementary service may be invoked when both the B-channels
are in use or when only one B-channel is in use.
An audible inband indication may be generated locally by the called
customer premises equipment, but no inband tone is provided by the
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).