Questions about red5phone

Hi, I am using the red5 RC3 Hudson stable 130 complied on netbeans and red5phone application. My platform is Window XP with SP3. When I use the red5phone application, it connected with a sip server. When there is a user A login first and afterward there is a user B login, user B can make a call to user A and the call is successful. but user A cannot make a call to user B. Otherwise, red5 server will have no response. That’s mean the later login user can make a call with the former login user, but it cannot reverse.

Anyone know how to solve the problem?

Thank you!

Vincent