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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello everybody,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>we have got a problem with sdp-nat on retries of a 200 OK packet. Due to slow response of our trunk the 200 ok is resend (up to 3 times) but sdp-nat is only done on the first two packets. We are running Kamailio 4.1.0 with the following setup:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Trunk --> NAT --> Kamailio --> Voip Bridge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The rtp stream from the trunk (public ip) is supposed to go to one of our media gateways (behind 1:1 nat). We use sdp_mangle_ip to replace the private IPs of our Mediagateway with the public ones. This goes well with the first 200 OK packet but not with a retry.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>A.A.A.A (public trunk media IP)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>B.B.B.B (our public media IP – 1:1 natted to I.I.I.I)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>INVITE Trunk --> Kamailio <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Connection Information (c): IN IP4 A.A.A.A<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>INVITE Kamailio --> Voip Bridge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> Connection Information (c): IN IP4 A.A.A.A<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>200 OK Kamailio <-- Voip Bridge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> Connection Information (c): IN IP4 I.I.I.I<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>200 OK Trunk <-- Kamailio <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Connection Information (c): IN IP4 B.B.B.B<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>200 OK Kamailio <-- Voip Bridge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> Connection Information (c): IN IP4 I.I.I.I<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>200 OK Trunk <-- Kamailio <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Connection Information (c): IN IP4 I.I.I.I<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>ACK Trunk --> Kamailio --> Voip Bridge<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Our configuration used is the following:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>route[RELAY] {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> xlog("L_INFO"," In route Block RELAY \n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> # enable additional event routes for forwarded requests<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if (is_method("INVITE|SUBSCRIBE|UPDATE")) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if(!t_is_set("onreply_route")) t_on_reply("MANAGE_REPLY");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> if (!t_relay()) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> xlog("L_NOTICE", " (ROUTE_RELAY) Relay failed, sending error \n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> sl_reply_error();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> exit;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>onreply_route[MANAGE_REPLY] {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> xlog("L_INFO"," In route Block MANAGE_REPLY \n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if ( isflagset(20) ) { -- we have to do nat<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> route(SDP_NAT);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> force_send_socket(KAMAILIO_TO_TRUNK_IP);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> } else {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> force_send_socket(KAMAILIO_TO_BRIDGE_IP);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>How can we handle the 200 OK retry? Is there a way to do this?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:DE'>Kind regards<br><br>Timo Klecker <o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:DE'><br><br></span><span style='mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>