Features
417
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
Fig. 227 Callback if user busy
Detailed Description
Tab. 238 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 PISN: can vary in an heterogeneous PISN (system: 45 minutes)
Callback to a busy external user B:
If user B is a communication server user, he must have his own direct dial number and
his communication server must also support the feature. There are three possible DDI
variants:
DDI number → user B
DDI number → user B + UG
DDI number → user B + KT
Suffix dialling functions
Tab. 239 Callback if user busy: Functions
End point Operating sequence / signalling on terminal Scope
A Once the function has been executed, 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.
Functions System phones Analogue terminal
Activate callback R9 or R*37
Clear callback #37
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