Hi: I use the latest code from SER cvs. the mysql db and ser are located on two computer. I registered 3 sip UA on the registrar which alse is a proxy. all the ua will expire after 1 hour. But after a while, i don't know how long it is. I found the location table has lost the ua record. my three sip ua is still online. I wonder whether the registrar and usrloc have other condition I don't know. What happens to them?? Thanks for your advice and help! Best Regards Sun Zongjun