[SIP Beyond VoIP] Establish a session with a user behind 2 NATs

[Mihai Richard]

Sorry, I forgot to mention that I¹m using sipsimple on the client side and
the OpenSIPS server.

Mihai

On 1/27/12 11:43 AM, "Adrian Georgescu" <ag at ag-projects.com> wrote:

> Hi Mihai,
> 
> This is a SIP server configuration issue that has to handle the NAt traversal
> for SIP signaling. The best place to fix this is the mailing list of the SIP
> server in question.
> 
> Adrian
> 
> On Jan 27, 2012, at 10:33 AM, Mihai Richard wrote:
> 
>> Establish a session with a user behind 2 NATs
>> Hello,
>> 
>> I have this problem and it only appears when a remote user is behind two NATs
>> and when I(behind one NAT) try to establish the session. The scenario is: I
>> send a INVITE to the remote client through the server, I receive the 100
>> Trying for that INVITE, after that, the remote client sends a 200/OK message
>> but apparently the server never replies to that OK or other subsequent
>> 200/OKs. When I run a tcpdump on the server I see that the ACK for the OK is
>> actually sent but at the wrong address. It¹s sent to 192.168.X.X which is the
>> internal address of the second router instead of sending to the public
>> address of the first router.
>> Does anybody know why this is happening and how this could be fixed?
>> 
>> Thank you,
>> --
>> Mihai Richard 
>> _______________________________________________
>> SIPBeyondVoIP mailing list
>> SIPBeyondVoIP at lists.ag-projects.com
>> http://lists.ag-projects.com/mailman/listinfo/sipbeyondvoip
> 
> 

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