security system that also supports door answering cam

Hi guys,

Great to find this place!

I have a beginner's question. the system I have in mind, is a nvr system with 2/3 cameras to place around the house, this seems easy to achieve, for example this one:

http://www.costco.com/Lorex-8-Channel-Stratus-HD-NVR-Security-System-with-2TB-HDD-and-4-1080p-Cameras.product.100087431.html

My question is, is there a module for doorbell video/intercom? Right now, all I can find are separate systems.

Thanks,

I like Aiphone equipment for this application.

If you only need one door, one of these would be ideal:

http://www.aiphone.com/home/products/jk/

If you needs are 1-4 doors, this one is the ticket:

http://www.aiphone.com/home/products/jm/