Without knowing the specifics of your various network devices, here's some general info that might help.
On most lans, you should only have one device that has DHCP turned on. This is typically your router (in your case, your Airport since the Cisco is not acting as a router anymore). Ensure all other devices have DHCP disabled.
If you can specify an IP address on any device that you will want to view from an external IP, do that now as well. Figure out what IP range your Airport will use for DHCP - let's say it's 192.168.0.1 to 192.168.0.100. Then pick an ip address outside that range like 192.168.0.200, and specify that as the static ip for your device. Note these addresses.
Next, port mapping should generally only be done to expose a device that's inside your LAN to the outside world. As such, the port mapping should be done on the device that is the "gateway" between your external IP address and your LAN. Again, in this case, this should be your Airport device. Turn off any other device's automatic port mapping.
To do port mapping on your Airport, you will need to log in to the Airport device, and find an option to do port mapping. Then you will need to expose the required ports (80, 8000, 8554, and 45631, from the sounds of it), and map them to their respective devices (the static ips you noted above).
When mapping ports, you might also need to specify TCP or UDP - if that info isn't available from the device you are mapping to, expose both, test that you can view the device from an external IP (ie. through 3G), then remove TCP and/or UDP and retest to figure out which one is required. In some cases you will need both, but you really only want to open up as much as you need, no more.
Hopefully this helps. Good luck!
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