<HTML><BODY> <p class="MsoPlainText"><span>Dear Asterisk developers,</span></p> <p class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span>I am currently writing my bachelor thesis in computer science. It's all about asterisk with a special focus on security (SIP over TLS & SRTP). So far so good, but now I have a question regarding SIP encryption in Asterisk. I noticed that voice traffic (RTP) flows from the caller's phone directly to the callee's phone without passing through Asterisk server. Now that sounds pretty logic to me.</span></p> <p class="MsoPlainText"><span>But the moment I activate SIP over TLS the route of the voice traffic changes so that it now all flows from the caller's phone to the server and from the server further on to the callee's phone. Why did this route change? Are there some legal reasons for that?</span></p> <p class="MsoPlainText"><span>Thanks a lot for your efforts.</span></p> <p
class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span>Further information regarding my environment:</span></p> <p class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span>server:</span></p> <p class="MsoPlainText"><span>---------------</span></p> <p class="MsoPlainText"><span>Asterisk 1.6.0-beta (srtp version from jpeeler: </span><a href="http://svn.digium.com/view/asterisk/team/jpeeler/srtp/"><span>http://svn.digium.com/view/asterisk/team/jpeeler/srtp/</span></a><span>)</span></p> <p class="MsoPlainText"><span>IP: 192.168.0.1</span></p> <p class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span>Phones:</span></p> <p class="MsoPlainText"><span>---------------</span></p> <p class="MsoPlainText"><span>2x snom 300, firmware version 7.1.30</span></p> <p class="MsoPlainText"><span>outbound proxy: 192.168.0.1:5061;transport=tls</span></p> <p class="MsoPlainText"><span>IP: 192.168.0.42</span></p> <p
class="MsoPlainText"><span>IP: 192.168.0.43</span></p> <p class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span> </span></p> <p class="MsoPlainText"><span>Best regards,</span></p> <p class="MsoPlainText"><span>Lukas</span></p> <p class="MsoPlainText"><span>FHNW University of Applied Sciences, Switzerland</span></p> </BODY></HTML>