Hi I have the following configuration: IP Phone ---- router ----- Eth Switch ------ router ------ IP Phone | | PC running SER If I try to make a call from on IP phone to the other I can get the voice through only every second call; I can't get it through everytime I try! I also tried restarting the routers but it didn't help. I tried to trace using ngrep and what I can see is that when I have the speech connection I get a "loop detected" message from the called phone while when the speech is not set up everything looks smooth. Do you have any suggestion? Thanks in advance //Umberto