Hi, I encounter a strange problem when setting up an sip (I am using sipura 2000) gateway. I am using ser-0.8.14. I can register UA1 and UA2 with proxy server. When I try to make a call, phone ringing is heard. However, there is no voice between UA1 and UA2. I hear nothing from each other. When I hang up the phone, the call is disconnected. It seems that though call setup could be established, but voice packets cannot be transmitted. What is my problem? Do you have any ideas? Thank you. Thomas