Multi Device for WAN Question

[owossobob]

I have XX34A camera. I wonder if I can set the multi-device options to include other cameras such as a friend's camera on a different DDNS than my own. I have login name and password for my friend's camera, but it doesn't connect. It is a different brand camera that I can view on the internet but when I add it in multi-device settings it times out trying to connect.