Hello,
This question raises a lot, but no simple answer, so I'm trying to ask it differently.
Let's say I have 5 FS servers and Opensips/Kamailio as a load balancer.
I'm afraid that creating it using xml files is not dynamic enough, and requires duplications.
mod_xml_rpc does not store that information on each update of the server itself, and there is no API for providing database management that I could find.