This is what I want to do:
Have at least four video cameras which can be recorded onto a pc hard drive. The recording should only start when my home alarm system goes off. At the same time the pc will dial out to a mobile phone so that the switched camera feeds can be seen on the mobile display. Also it would be nice, though not entirely necessary, if dialing a code into the same mobile phone would activate a relay or similar device back at the pc so that other things can be turned on remotely.
I know most of these things can be done separately but is there an off the shelf system that will do it all? If not I would appreciate ideas for preferably cheap individual bits that will make the whole.