After about 30 minutes I was so overwhelmed and annoyed that I've tried all Anschlussverianten until I gave up.
Except for the floor bell now everything works well, and I hate it anyway if someone is unexpectedly directly at the front door and ringing I can well do without it.
All in all, it's better to let the Höhrer connected by a technician, with the function I am satisfied.
Especially if you compare the price with the original one from Siedle, there is nothing to complain about.