Thanks for answering. I think you're rigth. I'm using the snom 320 and others phones without tls. The snom's manual sais that suport tls as a client. I don't know how to ask a tls sesion to ser, because if I put port=5061 in snom, I don't have answer, perhaps the petition is udp. Ideas? Do you know how to forbid non-tls connections?