Broadcasting over WAN

[seulater]

I am no Network guru. I have a project that we have made that uses the MOD5230 as a VoIP device. There is a option for the project to do broadcasting that allow multiple users to hear the audio from a source device at once. This works just fine on a LAN. The question was brought up could we implement this over a WAN. I have no idea. So i am asking you guys here if you know if its possible to do this.

Just so my question is clear this is what i am trying to achieve.

VoIP unit A is located in Chicago. VoIP units B-Z are located in say Florida. I would like the audio sent from unit A to hit units B-Z in a broadcast method. On a local LAN this works just fine. The WAN concept is what has me wondering if its still possible some way.

[Chris Ruff]

Interesting

UDP?
what port are you listening on?

Once the traffic is out on the internet it should be difficult to get it "inside" other NAT networks without port forwarding at each NAT interface to the internet

Chris

[thomastaranowski]

You would almost certainly want to use multicast for that. It's the technology typically used for just the scenario you describe. Multiple targets dynamically subscribe to your multicast group, and then when you send out multicast messages, it goes to everyone in that group.

http://en.wikipedia.org/wiki/Multicast

-Thomas Taranowski - Baring Forge

[seulater]

Its not clear to me how multicast can be used over a WAN network.

Chris, using UDP and port 21700