System Functions and Features as of I7.9
Features
419
sy
d-
020
0/3.
0
– I7.
9
– 1
1
.2009
8. 6. 17. 1
Callback if user busy
User A has the possibility of activating a callback to busy user B (callback request).
As soon as the busy user B becomes free, user A will be called back within 10 s. As
soon as A picks up the phone, the system automatically calls user B, who is now
free.
Fig. 204
Callback if user busy
Detailed Description
Tab. 257 Callback if user busy
The callback is triggered only to user A, who set the callback, regardless of whether
a CFU or CFNR to a user C has been activated at A.
Amount of time a callback if busy remains valid:
•
B is internal: 45 min
•
B is external: 30 min
•
B is in the PISN: can vary in an heterogeneous PISN (system: 45 minutes)
Interface
Operating sequence / signalling on the ter-
minal
Scope
A
Once the callback procedure has been exe-
cuted, A obtains the acknowledgement tone.
Restriction:
User A can only initiate one callback at a
time.
B
Possible interfaces:
internal, external
1)
, PISN
2)
Restriction:
Only one callback at a time can be loaded
onto an external user or a PISN user.
1)
Callback to the busy external user is possible only if the public network supports the service "Completion of
Calls to Busy Subscriber" (CCBS) end-to-end.
2)
If the PISN user is reached via the public network, the conditions of the public network for callback when
busy will apply.
!
"
#
HAZAAXXA