– Kamailio SIP Server –

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--- examples:caller-callee-behind-same-nat [2007/06/25 17:56]
213.96.13.38 Make correct the use of "avp_printf"
+++ examples:caller-callee-behind-same-nat [2007/06/25 19:56] (current)
@@ Line 1: / Line 1: @@
+====== How to set up nathelper/rtpproxy when both SIP UA's are behind same NAT ======
+The suggestion below is from Klaus Darilion
+This should work as long as there is only one client registered.
+If there are multiple branches, step 2 must be done in the branch route.
+<code>
+  #incoming call
+  # step 1
+  write src_ip $si to AVP
+  lookup("location");
+  # step 2
+  write destination IP $dd into AVP
+  compare AVPs
+  if AVP1!=AVP2 && natflag {use rtpproxy}
+</code>
+The following code snippet was presented by Tavis P.
+<code>
+  else if ( isflagset(2) and isflagset(3) )
+  {
+    log(1, "Both Clients are behind NAT");
+    # Store the destination domain into an AVP
+    avp_printf("$avp(i:450)", "$dd");
+    if ( avp_check("i:450", "eq/$src_ip/g") )
+    {
+      xlog("L_INFO", "Detected Two Clients Behind the Same NAT - Disabling Mediaproxy");
+      # Do not use mediaproxy as the clients seem to be behind the same NAT
+      resetflag(2);
+      resetflag(3);
+    }
+  }
+<code>

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