Maybe I am stupid, but since two weeks I will install SER with RTP Proxy as Proxy in our Network. The Situation. We have an new PBX System, with has direct SIP support. In the local network all works fine. But we want to add external Clients without VPN. For this reason I have installed a new server with two network Devices. One Device has an Public IP from the Internet, the other one a local IP. On the VoIP Device, wich I want to connect to our PBX via Internet I have adminstrate the internal PBX IP as Registra/Proxy und the Public IP as Ourgoing Proxy. With the constellation and many configurations I have found in the Internet the Register works and I can call an Internal telephone. But from the same telephone I can't call the VoIP device. And also it looks so, that the RTP Proxy dosnet work. The third problem is, that the PBX will send the UDP Packets direct to the Internet and not to the Proxy. I have also tested siproxd. With this programm I have an working constallation. The Problem is, that only one Client can be register. But I want much more. Can you help me, what I must configure that it works? Kind regards, Kai Dietrich