IAX Registration Load Balancing - ServerIron 4G

I am currently trying to devise a plan to load balance IAX registrations in my network. I am considering putting a ServerIron 4G device in front of 4 asterisk systems all using RealTime IAX registrations.

I don’t know enough about the IAX protocol, but I believe the ServerIron 4G should be able to handle this as it would just be a simple UDP load balancing scheme.

Does anyone have any experience with this general setup?

Also - on a side note, if I am using the same realtime database from multiple asterisk servers, is there any way to tag the database record with some server specific identifier, so I can tell which physical server the user registered against?