[Serusers] domain/realm routing

hi all

example:

uac1 with number 12345 and realm my1.mydomain.com uac2 with number 54321 and realm my2.mydomain.com and so on

i use enum to write the called brunch to the realm this funktion is ok (if someone call 12345/123, enum rewrite the uri to 123@my1.mydomain.com) but ser says no user 123@my1.mydomain.com

if i change in enum zonefile my1.mydomain.com to the ip address of the uac ser send the call to the uac1, but there is no connect because the uac1 is behind nat the next problem is if the user has a dynamic ip

is there a way to bind an uac/user to an realm (all calls 12345/branches route to uac1@my1.mydomain.com)

i hope you understand my problem

sorry for my bad english :(

regards raid