how to setup, system that can achieve result in title ?
I have an office with 5 people
3 FXO line - 3 shared lines recpetionist + one user each
receptionist need a phone that always ring for every fxo lines
office worker share each one shared line with receprionist
if office worker press donotdisturb outside line should not ring
but receprionist should still be able to make office worker phone ring transfering call or only to chat with him
