I've been fiddling with this for 3 hours now and read all your help.
I have 3 web cams all in my house
All are able to connect via wifi no problem
When I disable wifi and use 3G instead I can only see Computer 1 on the iPhone.
I downloaded and successfully installed that registry thing on all 3 computers
I've checkmarked the Port Range on the Icam software.
Computer 1 (Vista) - successfully forwarded the port through my router and checked
http://portchecker.net/udp.php?p=12000 and it was unblocked
Computer 2 (windows 7) - did the same thing and the port is still blocked
Computer 3 (XP) - Did the same thing and port is still blocked
Router is Linksys DIR 615
I've added the port forwarding rules to all 3 computers allowing UDP ports to open 12000-12100
Question - am I doing something wrong with the router configurations.