[Users] outgoing proxy through VPN ?

Hi, I am trying to setup openser as an outgoing proxy through VPN with the following setup: 172.16.1.1 - VPN endpoint and also the machine running openser 172.16.1.2 - remote NAT router at Network A(another VPN endpoint) 192.168.1.x - sjphone client behind NAT router(Network A) I can register the client through 172.16.1.1 fine but dialing out to other SIP address like 613(a)fwd.pulver.com never go through. If I register through the public address of the machine running openser, I can make the dialing fine and can sort of having a two way communication, though it drops after 5 seconds for unknown reason. I am wondering if anyone know if the first scenario(register through VPN) is possible. Also, how to trace why the communication drops for the normal registration method. thanks for any help in advance. regards, gary __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com