[OpenSER-Users] OpenSer replying to wrong NAT port

[Iñaki Baz Castillo]

Hi, I'm starting with OpenSer 1.2.1-1 and have a strange problem. This occurs 
always with users behind NAT with a mapped NAT port different of his device 
SIP port. For example:

* user 807:
     device:       sip:192.186.0.204:5061
  is mapped in the NAT router as:
      sip:212.121.235.18:1055

So in "location" table I see:
---------------------------------
  username    contact                                       received
  807             sip:807 at 192.168.1.204:5061       sip:212.121.235.18:1055
  800             sip:800 at 212.121.235.18:5080     NULL
---------------------------------

800 is a user with STUN.

I have some services in Asterisk accesible via public and private numbers in 
OpenSer. Public numbers (500) don't need auth in INVITE.

When 807 call to any private number (or internal users as 800) OpenSer ask him 
for auth, but OpenSer replies this messaje to a wrong port:
---------------------------------
  # 807 INVITE 800
  U 212.121.235.18:1055 -> 82.94.0.210:5060
  INVITE sip:800 at openser.domain.org SIP/2.0 

  # OpenSer 407
  U 82.94.0.210:5060 -> 212.121.235.18:5061   <--- WRONG DST PORT
  SIP/2.0 407 Proxy Authentication Required 
---------------------------------
As you see, OpenSer send the 407 message to the NAT IP but to the device SIP 
port instead of the NAT port. So 807 sends again and again the INVITE.



But if 807 calls to a public number (500) it get the call but when 807 does 
BYE, the response to that BYE is again wrong:
---------------------------------
  # 807 INVITE 500
  U 212.121.235.18:1055 -> 82.94.0.210:5060
  INVITE sip:500 at openser.domain.org SIP/2.0

  # OpenSer OK
  U 82.94.0.210:5060 -> 212.121.235.18:1055
  SIP/2.0 200 OK 

  # 807 BYE 500
  U 212.121.235.18:1055 -> 82.94.0.210:5060
  BYE sip:1800 at 82.94.0.210:5070 SIP/2.0

  # OpenSer OK
  U 82.94.0.210:5060 -> 212.121.235.18:5061   <--- WRONG DST PORT
  SIP/2.0 200 OK
---------------------------------


I hope this is a bug in my OpenSer configuration. Please, could anyone tell me 
with funcions related to this issue should I verify?

Thanks a lot.



-- 
Iñaki Baz Castillo
ibc at in.ilimit.es