Hello everybody,

I'm trying to install a extra bell behind a Selti SL/C202-23 intercom but
do not have any tech docs. The problem is that I don't have the capacity
to use more than two wires from the doorbell to the intercom. Is it still
possible to wire a regular extra door bell behind the intercom? If yes,
what are the pins I have to use for that? Or do i have to use a special
kind of doorbell?

Ideally someone could point me to the techdocs for this intercom so I can
figure it out by myself.

I tried to contact Selti directly, but email is always bouncing back. Is
the company still existing? Has it been bought by another company? Also
intensive websearch on technical docs have been unsuccessful.

Thank you in advace
Thomas