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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I try to setup a SIP infrastructure with Kamailio server in private network and a pass through Kamailio proxy in the DMZ for NAT handling. (->
TEST.jpg)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The pass through proxy uses a new routing algorithm and this works fine for external calls to internal calls. (->Kamailio.cfg.txt)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The logic behind is if a packet on external interface arrives, the proxy change the URI and forward the packet to the internal SIP server.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Otherwise, the proxy shall forward the packet to external interface if a packet arrives at the internal interface.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Because the SIP server has a fix IP, it’s easy to route to this server, but the way back is more complicated and I think my algorithm is not working.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But the first problem is the routing behavior from the private server if I try to make a call from intern to extern. The server sends the request
to the external IP address from the client and the IP address from the pass through Kamailio proxy is not considered.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-bottom:12.0pt"><span lang="EN-US" style="font-family:"Courier New"">8(2720) ERROR: <core> [udp_server.c:576]: udp_send(): sendto(sock,0x7f4724dd9238,1328,0,192.168.1.20:5060,16): Network is unreachable(101)<br>
8(2720) ERROR: tm [../../forward.h:208]: msg_send(): udp_send failed<br>
8(2720) WARNING: tm [t_fwd.c:1610]: t_send_branch(): ERROR: t_send_branch: sending request on branch 0 failed<br>
8(2720) exec: *** cfgtrace:request_route=[RELAY] c=[/usr/local/etc/kamailio/kamailio.cfg] l=553 a=24 n=sl_reply_error<br>
8(2720) ERROR: sl [sl_funcs.c:387]: sl_reply_error(): ERROR: sl_reply_error used: Unfortunately error on sending to next hop occurred (477/SL)<br>
8(2720) exec: *** cfgtrace:request_route=[RELAY] c=[/usr/local/etc/kamailio/kamailio.cfg] l=555 a=2 n=exit<br>
7(2718) exec: *** cfgtrace:request_route=[DEFAULT_ROUTE] c=[/usr/local/etc/kamailio/kamailio.cfg] l=474 a=5 n=route<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-bottom:12.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE">To change the IP address which is used from the private server as the destination address,
I added the following lines to the Kamailio.cfg. <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-family:"Courier New"">modparam("registrar", "use_path",1)<br>
modparam("registrar", "path_mode", 2)<br>
modparam("registrar", "path_use_received",1)<br>
modparam("path", "use_received", 1)<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE">But the routing behavior has not changed. (perhaps this configure was not the right)<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE">Is there a way to configure the private server that the last IP address from the record-route header is used?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE">Cheers,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE">Kai<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-bottom:12.0pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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