Features
419
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
Suffix dialling functions
Tab. 241 Callback to free user: Functions
System configuration
No settings
Reference to Other Features
"Callback if user busy", page 416
"Wait until free", page 419
"Message function", page 408
9. 6. 18. 3 Wait until free
The Wait-until-free feature is a Callback-if-busy feature without the user who initiates
the call having to hang up. He stays on the phone and waits until the busy user be-
comes free. The callback is triggered as soon as the called user has been free for 5
seconds. The connection is then set up automatically.
Fig. 229 Wait until free
Detailed Description
Tab. 242 Wait until free
User A must carry out the function with the handset off-hook and not via the loud-
speaker key.
"Wait until free" works only with cordless phones.
Functions System phones Analogue terminal
Activate callback R9 or R*37
Clear callback #37
End point Operating sequence / signalling on the terminal Scope
A • Once the callback function has been executed, A obtains the
acknowledgement tone.
• As soon as user B is free, A obtains the ring-back tone.
B Possible interfaces:
internal, external
1)
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.
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