Re: [Users] nathelper/rtpproxy when both SIP UA are behind same NAT

Rafael R. GV wrote:

Hi I am still trying to solve this issue: ...using avpops to enable SER to see if the UAs are located behind the same address and then trying to let the UAs speak directly to each other (without force rtpproxy), please see my config. below and send some advice for what do I have to do in route 3?

... if (!lookup("location")) { log(1,"unable to locate user X ... sending to route(4)! \n"); # handle user which was not found route(4); break; };

            ### Test if UAS are in the same NAT:
            # get the host part of the final uri (IP part) and

store it in AVP ID 13

            avp_write("$ruri/domain", "i:13");
            if (avp_check("i:13","eq/$src_ip/i")) {
                    log(1, "source IP is the same as destination

IP\n"); route(3) ;t_on_reply("3"); break; }; avp_delete("i:13/g"); ... # -------------- Same NAT Call Routing (no force rtpproxy) ----

route[3]{ log(1," route[3]: UAs are in the same nat, NO force_rtp_proxy "); fix_nated_contact(); if(!t_relay()){ sl_reply_error(); }; log(1, "Route[3]: Send it out now!!!\n"); }

thanks rafael

Just want to mention that if your clients use STUN than this fix will not work (as the client acts like it is on a routable IP), however i have encountered many issues with NATs that do not hairpin RTP data from clients behind the same NAT to each other.

My solution was to detect (using similar logic to that above) if both clients are coming from the same IP address and force RTP/Media proxy otherwise the call would have no audio

Its a little OT but i thought i would mention it

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