====== 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>