<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Have your tried the nat_traversal module available in OpenSIPS? There is documentation with it that explains how to solve these situations.<div><br></div><div>Adrian</div><div><div><br><div><div>On Apr 9, 2009, at 3:04 PM, Uwe Kastens wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Adrian,<br><br>To be more specific:<br>- the router is not blocking sip - no sip-alg<br>- the timeout for the nat seems to be lower than the timeout for the<br>registration.<br>So the router will simply cut the connection for the reverse nat. So the<br>invites to the UA behind the router are "running" on a closed port.<br><br>I would like to have a solution to solve this for the most UA - without<br>any configuration issue on the UA or the router.<br><br>BR<br><br>uwe<br><br><br><br><blockquote type="cite">Uwe,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">It really depends on how strange is strange. Is this about routers that<br></blockquote><blockquote type="cite">seem to block incoming SIP traffic? There is a topic about this on<br></blockquote><blockquote type="cite"><a href="http://voip-info.org">http://voip-info.org</a> search for SIP ALG.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">If is about something else maybe you can define strange and other people<br></blockquote><blockquote type="cite">might help.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Adrian<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">On Apr 9, 2009, at 2:43 PM, Uwe Kastens wrote:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Hello,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I am searching for a solution for some SIP Clients which are behind some<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">strange router. What is the best way to handle this? Send keepalive<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">messages from the router to the UA or force the UA to send keepalive<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">packages.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I think a can handle this by modparam("nathelper", "sipping_method",<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">"INFO")?<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">BR<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Uwe<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">-- <br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">kiste lat: 54.322684, lon: 10.13586<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">_______________________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Users mailing list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a> <<a href="mailto:Users@lists.opensips.org">mailto:Users@lists.opensips.org</a>><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><br></blockquote></blockquote><blockquote type="cite"><br></blockquote><br><br>-- <br><br>kiste lat: 54.322684, lon: 10.13586<br></div></blockquote></div><br></div></div></body></html>