[Users] Proxy/Registrar and NAT

Hello list members, I'd like to use multiple proxies/registrars in a SRV managed failover/load-balancing situation. For NAT purposes I could use a couple of dedicated load-balancers with path support to store the NAT enabled route in the location table. The registrars have a shared location table on a database server. This situation works, but.... Is there a possibility to skip the load-balancers? I want the proxy/registrar to store the NAT-route somehow in the location table, so that when the contact needs to be contacted, the proxy can determine if it can send the request itself, or it needs to forward it via one of the other proxies (the one with which the contact has the NAT relation). I hope you understand the topology, otherwise I might need to create some ascii-art. -- Greetings, Alex Hermann Speakup