[Closed] Integrated cctv with doorphone

Hello,

I'm designing a cctv security system which has to be integrated with a door phone system. Let me explain the purpose:

Outside: 1 Video door phone with standard camera 5 standard video security camera's

all composite.

Inside: 3 lcd-inwall-monitors of 12 or 15", non-touch next to it a doorphone intercom without videoscreen. This intercom has multiple free programmable buttons (rs232 of contact).

When the doorbell rings (alarm-contact), the monitors display the main camera with the others at the side of te screen.

When the user presses button 1 eg, camera1 is viewed in full screen When button 2 is pressed, the next camera is viewed in full screen Button 3 gives a quad-view ...

So, I'm looking for something that does the switching/multiplexing with simple rs232 commands. As a recording device, everything is possible (geovision, dedicated micros, ...) or a combination of a recorder with the above multiplexer.

Can someone help me to find such a device ?

Thanks in advance,