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NEAX2400 IPX ISDN Features and Specifications
Page 150
NDA-24311, Issue 1
C-148 Call Completion to Busy Subscriber (CCBS)
Service Conditions (cont’d)
2. If a Q-SIG data link is down during CCBS assignment, this CCBS is not assigned. If the link is down while
a calling station is canceling its CCBS assignment operation, only CCBS to that station is cancelled.
(Since the message is not sent to the station to which CCBS is set, CCBS to that station is not cancelled.)
If the link is down during Call Back, CCBS to a called station is cancelled.
(Since the message is not sent to the calling station, CCBS to that station is not cancelled.)
If the link is down when a calling station answers to Call Back, CCBS to that station is cancelled.
(Since the message is not sent to the called station, CCBS to that station is not cancelled.)
3. When a Q-SIG data link has been down upon CCBS assignment, and if another link is available, this link
may be used for sending a setting message, Q-SIG routes only. Path reservation (if used) and CCBS Call
Back are established via the route which has been used for sending a CCBS setting message; the other
routes cannot be used. If all B-channels of the relevant route cannot be used (B-channel selection cannot
be made) and path reservation or CCBS Call Back cannot be activated, the following operation is made as
path reservation/CCBS Call Back failure:
a.) Failure at a calling office : service is cancelled and busy tone is sent to the calling station.
b.) Failure at the intermediate office: path reservation or CCBS Call Back error message is sent to
the calling station
: CCBS cancellation message is sent to the called station.