<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Inaki,<div><br></div><div>This tool is very useful, as it can automatically detect the problem and can save a lot of time for detection.<div><br></div><div>This SIP ALG phenomena is however a plague.</div><div><br></div><div>I do not know any situation when this works or when somebody would really want to use it. All the efforts of the SIP service providers I know of are directed into disabling them altogether while router manufacturares are in frenzy to tick another checkbox on their packaging 'SIP enabled'. These manufacturers spend without any analysis whatsoever their 8 hour budget on the issue and then move casually forward leaving havoc behind them.<div><br></div><div>The only way to eradicate this plague is to move towards the use of TLS as a standard transport in SIP. With the new design this will be feasible.</div><div><br></div><div>Regards,</div><div>Adrian</div><div><br></div></div><div><div>On Jun 14, 2009, at 2:19 AM, Iņaki Baz Castillo wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi, as part of my personal battle against SIP ALG routers, I've created an <br>utility to detect such routers:<br><br> <a href="http://dev.sipdoc.net/wiki/sip-stuff/SIP-ALG-Detector">http://dev.sipdoc.net/wiki/sip-stuff/SIP-ALG-Detector</a><br><br>It has two parts: client and server:<br><br>Basically, the client node running into the LAN sends an INVITE to the server <br>node (running in a host with public IP).<br>The request could be modified by the LAN router if SIP ALG is enabled.<br>The server encodes the received request in Base64 and appends it to the SIP <br>response.<br>The client receives the response, decodes the body and gets the request as it <br>arrived to the server.<br>Then it creates a diff between the original request and the the request the <br>server node received. These differences are displayed in the screen.<br><br>Both, UDP and TCP, tests are performed.<br><br><br>The client node is coded in Ruby and should work in any operating system (if <br>Ruby is installed).<br><br>The server node is also coded in Ruby.<br><br><br>For those interested in trying it, I have a server node running in my personal <br>server:<br> 87.98.230.161:5060<br>You can test the client against my server.<br><br><br>Feedback is welcome :)<br>Regards.<br><br><br>-- <br>Iņaki Baz Castillo <<a href="mailto:ibc@aliax.net">ibc@aliax.net</a>><br><br><br>_______________________________________________<br>Users mailing list<br><a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><br><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><br></div></blockquote></div><br></div></body></html>