[Freeswitch-users] NAT problems, FS keep sending ACK to local IP Address

[Donny Hardyanto]

Hi, I have “30 second-then-hangup” problem. I have traced the problem, and
turn out that the server keeps sending ACK to SIP Client local IP Address
(it is behind the NAT).



Is it a misconfigure in FS? I notice that in SDP received from SIP Client
the rtcp port is followed by SIP Client local IP address. Is it right or
not?



Here is the SIP trace result:





recv 738 bytes from udp/[118.xxx.xxx.xxx]:6900 at 10:21:33.992037:

   ------------------------------------------------------------------------

   SIP/2.0 200 OK

   Via: SIP/2.0/UDP 192.168.1.150:57699
;rport=57699;branch=z9hG4bK4Q9KyFrDr24gc

   From: "400001" <sip:400001 at 180.xxx.xxx.xxx>;tag=59etrFg3F0pvg

   To: <sip:400002 at 118.xxx.xxx.xxx:6900;line=b1bb925d6ab814e>;tag=189404928

   Call-ID: ea145392-ddb9-1231-9c95-94de80208578

   CSeq: 53085761 INVITE

   Contact: <sip:linphone.android at 192.168.8.47:6900>

   Content-Type: application/sdp

   User-Agent: LinphoneAndroid/0.3.7 (eXosip2/3.6.0)

   Content-Length:   260



   v=0

   o=400002 1335 3400 IN IP4 118.xxx.xxx.xxx

   s=Talk

   c=IN IP4 118.xxx.xxx.xxx

   b=AS:380

   t=0 0

   m=audio 7078 RTP/AVP 98 101

   a=rtpmap:98 speex/8000

   a=fmtp:98 vbr=on

   a=rtpmap:101 telephone-event/8000

   a=fmtp:101 0-11

   a=rtcp:7079 IN IP4 192.168.8.47

   ------------------------------------------------------------------------

nta.c:3201 agent_recv_response() nta: received 200 OK for INVITE (53085761)

nta.c:3264 agent_recv_response() nta: 200 OK is going to a transaction

send 434 bytes to udp/[192.168.8.47]:6900 at 10:21:33.992228:

   ------------------------------------------------------------------------

   ACK sip:linphone.android at 192.168.8.47:6900 SIP/2.0

   Via: SIP/2.0/UDP 180.xxx.xxx.xxx:57699;rport;branch=z9hG4bK502c0a9gNBU3Q

   Max-Forwards: 70

   From: "400001" <sip:400001 at 180.xxx.xxx.xxx>;tag=59etrFg3F0pvg

   To: <sip:400002 at 118.xxx.xxx.xxx:6900;line=b1bb925d6ab814e>;tag=189404928

   Call-ID: ea145392-ddb9-1231-9c95-94de80208578

   CSeq: 53085761 ACK

   Contact: <sip:mod_sofia at 180.xxx.xxx.xxx:57699>

   Content-Length: 0



   ------------------------------------------------------------------------

nta.c:8169 outgoing_send() nta: resent ACK (53085761) to UDP/
192.168.8.47:6900



Thanks,



Regards



Donny
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