[Users] Problem with openser.cfg

Hello, I have installed openser-1.0.1 on 2 SIP proxies, and registered one user to each proxy. Such as: 1001@proxy1 2001@proxy2 , I am using 1001 to call 2001. It seems that proxy1 cannot relay SIP packets to proxy2. How can I deal with it? I am using the default configuration file openser.cfg. Is there any problem? Btw, I added some log information to openser.cfg such as log(4, "debug info....") and "log_stderror" has been set to "yes", but I cannot see any debug infomation on stderr. I don't know WHY. Is there any body would like to give me some advice ? THANKS A LOT ! Gh Li