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4.7 Extended settings
4.7.1 DoorPhone
Ringing timeout:
time ringing.
Maximum call duration:
when call is picked up timer for call duration limit is activated. When you
insert empty, then there is no limit. The 10sec before call end you hear tone after which you can dial
character for call prolongation and by this prolong the call about same time period.
Call prolongation character:
* or # and usage is descripted in “Maximal call duration”.
