[Freeswitch-users] Load Balacing

Hello: I am using two boxes, with same domain, to register about 1000 users working together a DNS box doing round robin to resolve two differentes Ips one to each box. This two boxes are using the same database (through unixodbc). When I use the funcion sofia_contact or sofia profile status both boxes show the status of the user. Does not matter where the resgistration was did. But when I try to call the user this call fails, the call only works if the call is sent through the same box where the user is registered. Any ideas where i need to looking for ? Thx in Advance.