Hello, I'm using 3cx v15.5.6354.2. I'm testing our new sip provider. I have activated the rebound on the dnd status to an external number (my cell). When I call in, I get to the extension, it forwards the call to my cell. On the cell, I hear the 3CX greeting asking if I want to take the call. When I press 1 to take the call, all I hear is silence. In my trace, I get 481 response from the sip trunk provider. What can I do ? Thanks. Marco.