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PORTP Proxying with OpenSIPS/Kamailio/OpenSER
 

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    <p>I have an OpenSIPS server which listens on multiple IPs. If I route the calls back out to the next point, I want to ensure all signalling and media come from the IP the call originally landed on (I don't want the caller and callee to know each other's IP addresses).</p> <p>I believe what I need for this something like RTPProxy.</p> <p>My question is do I need one RTPProxy server per IP address, or can I route multiple IPs through a single server? Is there a better solution?</p> <p>I'm going to try this myself, but I'm struggling to get the RTPProxy server running correctly (my ignorance rather than necessarily any issues with RTPProxy). I asked ahead of time just to see if anyone knew if I was wasting my time setting it up or not.</p> <p>[UPDATE]</p> <p>For anyone interested, this is how I got it working, though I'm not sure I want to run with this as the final solution. Needs more testing. For 2 IPs, with topology hiding and RTP proxying. Along with the answer below, I hope it helps someone.</p> <p>Load the rtpproxy processes -</p> <pre><code>rtpproxy -l _your_public_ip_1_ -s udp:localhost:7722 rtpproxy -l _your_public_ip_2_ -s udp:localhost:7723 </code></pre> <p>Then mod the kamailio.cfg file -</p> <pre><code>loadmodule "/usr/local/lib64/kamailio/modules/topoh.so" modparam("topoh", "mask_key", "Your_key_here") modparam("topoh", "mask_ip", "10.0.0.1") </code></pre> <p>The next bit creates two groups for RTP proxy - 1 &amp; 2 -</p> <pre><code>#!ifdef WITH_NAT # ----- rtpproxy params ----- modparam("rtpproxy", "rtpproxy_sock", "1 == udp:127.0.0.1:7722") modparam("rtpproxy", "rtpproxy_sock", "2 == udp:127.0.0.1:7723") </code></pre> <p>then in the NAT section of the standard (shipped) config, you select which group to use in the proxying based on the IP the inbound call landed on. rtp_proxy_manage is a very high level version of the force_ and unforce_ commands. Basically it just fires up and does everything for you -</p> <pre><code>route[NATMANAGE] { #!ifdef WITH_NAT .... if($Ri=="X.X.X.1") set_rtp_proxy_set("1"); if($Ri=="X.X.X.2") set_rtp_proxy_set("2"); rtpproxy_manage("",$Ri); </code></pre>
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