freeswitchforum.com

        <param name="context" value="local"/>
        <param name="sip-port" value="5060"/>
        <param name="dialplan" value="XML"/>
        <param name="rtp-ip" value="$${local_address}"/>
        <param name="sip-ip" value="$${local_address}"/>
        <param name="auth-calls" value="true"/>
        <param name="aggressive-nat-detection" value="true"/>
        <param name="user-agent-string" value="Test Server"/>
        <param name="NDLB-force-rport" value="true"/>
        <param name="multiple-registrations" value="contact"/>

------------------------------------------------------------------------
   INVITE sip:domik108@87.239.25.137:5060 SIP/2.0
   Via: SIP/2.0/UDP 184.22.113.193;rport;branch=z9hG4bK8DD6y82912egg
   Max-Forwards: 69
   From: "Evgeniy 101" <sip:101@vds.somehost.ru>;tag=8K5XNjjH9mFDF
   To: <sip:domik108@87.239.25.137:5060>
   Call-ID: 6fa5795c-6e72-1232-58a3-00155dbcd785
   CSeq: 61041870 INVITE
   Contact: <sip:mod_sofia@184.22.113.193:5060>
   User-Agent: Test Server
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, refer
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 251
   X-FS-Support: update_display,send_info
   Remote-Party-ID: "Evgeniy 101" <sip:101@vds.somehost.ru>;party=calling;screen=yes;privacy=off
   
   v=0
   o=FreeSWITCH 1402726755 1402726756 IN IP4 184.22.113.193
   s=FreeSWITCH
   c=IN IP4 184.22.113.193
   t=0 0
   m=audio 29116 RTP/AVP 8 0 101 13
   a=rtpmap:8 PCMA/8000
   a=rtpmap:0 PCMU/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=ptime:20
   ------------------------------------------------------------------------

   ------------------------------------------------------------------------
   INVITE sip:shurin107@192.168.0.2:5061 SIP/2.0
   Via: SIP/2.0/UDP 184.22.113.193;rport;branch=z9hG4bK9p6y03KDZB52B
   Route: <sip:shurin107@94.253.113.200:5061>
   Max-Forwards: 69
   From: "Evgeniy 101" <sip:101@vds.somehost.ru>;tag=1vvtF3mZSZtvK
   To: <sip:shurin107@192.168.0.2:5061>
   Call-ID: faff2caa-6e73-1232-58a3-00155dbcd785
   CSeq: 61042202 INVITE
   Contact: <sip:mod_sofia@184.22.113.193:5060>
   User-Agent: Test Server
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, refer
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 251
   X-FS-Support: update_display,send_info
   Remote-Party-ID: "Evgeniy 101" <sip:101@vds.somehost.ru>;party=calling;screen=yes;privacy=off
   
   v=0
   o=FreeSWITCH 1402728626 1402728627 IN IP4 184.22.113.193
   s=FreeSWITCH
   c=IN IP4 184.22.113.193
   t=0 0
   m=audio 27908 RTP/AVP 8 0 101 13
   a=rtpmap:8 PCMA/8000
   a=rtpmap:0 PCMU/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=ptime:20
   ------------------------------------------------------------------------

<param name="nat-options-ping" value="true"/>

send 908 bytes to udp/[217.146.12.37]:5063 at 16:28:06.365127:

send 1060 bytes to udp/[94.253.113.200]:5061 at 21:14:17.686322:

<!-- NAT Support Parameters -->

  <Handle_VIA_received ua="na" value="No" />
  <Handle_VIA_rport ua="na" value="No" />
  <Insert_VIA_received ua="na" value="No" />
  <Insert_VIA_rport ua="na" value="No" />
  <Substitute_VIA_Addr ua="na" value="No" />
  <Send_Resp_To_Src_Port ua="na" value="No" />
  <STUN_Enable ua="na" value="No" />
  <STUN_Test_Enable ua="na" value="No" />
  <STUN_Server ua="na" value="" />
  <TURN_Server ua="na" value="" />
  <Auth_Server ua="na" value="" />
  <EXT_IP ua="na" value="" />
  <EXT_RTP_Port_Min ua="na" value="" />
  <NAT_Keep_Alive_Intvl ua="na" value="15" />
...
<!-- NAT Settings -->

  <NAT_Mapping_Enable_2_ ua="na" value="No" />
  <NAT_Keep_Alive_Enable_2_ ua="na" value="No" />
  <NAT_Keep_Alive_Msg_2_ ua="na" value="$NOTIFY" />
  <NAT_Keep_Alive_Dest_2_ ua="na" value="$PROXY" />