[SR-Users] Ynt: Using Kamalio as a proxy for internal servers

You can use force socket in kamailio.cfg in these ways; 1- force_send_socket(udp:10.10.10.10:5060); or if you want to use variable in it; 2- $fs = "udp" + $var(x) + ":5060": Regards Egemen U. ________________________________ Gönderen: Moshe Katz &lt;kohenkatz(a)gmail.com&gt; adına sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; Gönderildi: 7 Eylül 2020 Pazartesi 15:44 Kime: Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; Konu: Re: [SR-Users] Using Kamalio as a proxy for internal servers Olle, If I define another listen line, how do I tell Kamailio to use one listen line for inside traffic and the other for outside traffic? Sergey, Using IPv6 internally is a great idea. I'll have to see if I can try it. Thank you both! On Mon, Sep 7, 2020 at 7:39 AM Olle E. Johansson <oej@edvina.net<mailto:oej@edvina.net>> wrote: On 7 Sep 2020, at 12:24, Sergey Safarov <s.safarov@gmail.com<mailto:s.safarov@gmail.com>> wrote: To resolve such an issue I switched to use IPv6 on internal SIP servers for signaling and IPv4 for RTPmedia. For me works like a charm. Very elegant solution! /O On Mon, Sep 7, 2020 at 9:58 AM Olle E. Johansson <oej@edvina.net<mailto:oej@edvina.net>> wrote: You need to define another listen= without the advertise for communication with internal servers. Either another IP or another port. /O On 6 Sep 2020, at 17:34, Moshe Katz <kohenkatz@gmail.com<mailto:kohenkatz@gmail.com>> wrote: Hello all, (Note: I previously posted a more detailed version of this question on StackOverflow at https://stackoverflow.com/q/63760506/829970 . This version is simplified to fit better in an email.) I have Kamailio 5.4.1 (and RTPEngine) running on an internal server with a private IP address 172.31.7.96 and One-to-one NAT to an external IP address. The external IP is 192.0.2.100. (Note: The internal IP addresses are all unedited, but the public IPs have been replaced with TEST-NET-1 and TEST-NET-2 example addresses.) I will eventually be doing transcoding with RTPEngine, but for now this is a simple SIP Proxy. Kamailio is installed on Ubuntu 18.04 using the DEB packages from dev.kamailio.org/kamailio54<http://dev.kamailio.org/kamailio54> and is using the stock configuration that comes with those packages, except for the following changes: #!define WITH_NAT #!define WITH_RTPENGINE #!define WITH_MYSQL #!define WITH_AUTH #!define WITH_IPAUTH listen=udp:0.0.0.0:5060<http://0.0.0.0:5060/> advertise 192.0.2.100:5060<http://192.0.2.100:5060/> #!define DBURL "mysql://kamailio:REAL_PASSWORD_HERE@127.0.0.1/kamailio<http://kamailio:REAL_PASSWORD_HERE@127.0.0.1/kamailio>" I have internal SIP servers with private IP addresses in the 172.31.7.0/24<http://172.31.7.0/24> range that I want to have send all SIP traffic through the Kamailio server. The internal servers are running a Java SIP client with the `OUTBOUND_PROXY` setting set to 172.31.7.96. The problem I have is that the SIP `200 OK` message sent by Kamailio to my SIP server has its `Record-Route` header set to the public IP address `192.0.2.100` instead of the private address `172.31.7.96`. The SIP client therefore tries to send the `ACK` message back to the public address, but it has no route to the public address so the ACK never gets sent. How can I configure Kamailio to use the public IP for external traffic but the private IP for communicating with internal machines on the same subnet? I tried setting `mhomed=1`, but the machine isn't actually multi-homed so that didn't work. I thought of adding a second listen line `listen=udp:172.31.7.96:5061<http://172.31.7.96:5061/>` and having the internal servers talk to port 5061, but that doesn't work because Kamailio uses the 5061 definition for the external side too. I see in the docs that it is possible to name the listener lines, but I don't understand how to use those names in a way that would be relevant to my issue. Thank you very much for your help, Moshe _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users