Aastra Ascotel IntelliGate 2065 - Page 505

Ascotel IntelliGate 2025/2045/2065
Part 2 Features 505
Detailed Description
Tab. 2.231: Callback if subscriber busy
The callback is triggered only to subscriber A, who set the callback, regardless of
whether a CFU or CFNR to a subscriber 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)
Callback to an external busy subscriber:
If the B subscriber is a PBX subscriber, he must have his own direct dial number
and his PBX must also support the feature. There are three possible DDI variants:
DDI number → SC B
DDI number → SC B + UG
DDI number → SC B + RA
Suffix dialling procedures
Tab. 2.232: Callback if subscriber busy: Procedures
Interface Operating sequence / signalling on the ter-
minal
Scope
A Once the callback procedure has been exe-
cuted, A obtains the acknowledgement
tone.
Restriction:
Subscriber 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 or PISN subscriber.
1)
Callback to busy external subscriber is possible only if the public network supports the service "Comple-
tion of Calls to Busy Subscriber" (CCBS) end-to-end.
2)
If the PISN subscriber is reached via the public network, the conditions of the public network for callback
when busy will apply.
System Terminals a/b terminal
Activate callback R9 or R*37
Clear callback #37