Home intercom and call forwarding

[JohnnyJazz]

I installed my home office in the attic and my workshop is in the basement. In between there are the kitchen, dining area and the bedrooms. The problem is I could be in any of these rooms and my wife in any other. So when we want to talk to each other we have to shout in the starecase and wait for the other to answer. To make the situation more complicated, I usually leave my mobile phone in the living room and most of the time can't hear it ringing because I'm at the other end of the house.

The idea would be to install an intercom system with speakers and microphones in every room of the house and be able to forward my phone to the system so I can answer it from anywhere I am.

I would ready appreciate any suggestion for a system that is cheap, easy to install and available in Bangkok

Thanks in advance

JJ

[CharlieH]

Pointless remark/response removed.