[SR-Users] Multiple kamailio sharing single Registration DB

Hi all, How i can setup multiple kamailio servers should share the single registration DB. Requirement: I have two kamailio instances Kamailio-A and Kamalio-B ,both are sharing the same DB which is postgre*SQL *which is hosted in some other server. When a USER AGENT A send a register packet to Kamailio-A it is updating the registration status in the DB. But in kamailio-B if am doing a lookup(location) i am getting -1 as return value. kamctl ul show <USER_AGENT> 404 AOR not found 1. How kamailio retrieving the registrations status ? Is it from the DB or from the internal cache ? 2. How can i read the registration status from the DB always ? Let me know if any one need any more information. Regards Varghese Paul