that is the same good app i have for android. the free version only supports a few camera, the paid version has more featiures and suppors many more cameras, you can see, control and listen to them from the device. you can also view them all in a matrix.
The app supports 100's of makes and models. i can see dlink, foslin and axis cameras all at the same time
i suggest that you place all your camera behind a h/w firewall and change the default port and hide using NAT.
inside: 192.168.1.2:8080
outside: your-domain:5172
or any number above 1024, try not to use common posrt numbers like 8080 etc
using NAT overload then all your device can be access through your domain name and just change the port # for each device, ie three camera could haves ports 5171, 5272 and 5373 use anything than you can easily recall