Use a dect telephone of a FritzBox as alarm

is it possible to use a dect telephone, that is connected to a FritzBox as an alarm?

Does somebody has any idea?

Thanks for any help.

Speaking for the Fritzbox and the DECT phone, that is possible. You can setup the alarm via the Fritzbox webpage.
However I believe (presently?) the Fritzbox binding can’t be used to control the alarm as well as the other phone functions.

With an alarm I mean e.g. if a window is open, then the DECT telephone rings.
Is a script known that the DECT phone brings to ring? This script could then be thrown over a rule.

I use now a PHP-Skript for the Alarm: