[OpenSIPS-Devel] disabling outbound TCP connection for nated UA

[Emmanuel BUU]

Bogdan-Andrei Iancu a écrit :
> Hi Emmanuel,
>
> In theory this will be nice and correct, but practically speaking it is 
> too difficult to do , as the SIP part needs to be aware of the transport 
> layer and vice versa .
>   
This already the case as the contact that is stored in the USRLOC module 
contains a transport indication (that is if the UA is using TCP)
> Like you need to "know" that a SIP URI points behind a NAT, store the 
> info with the RURI and pass it to the transport level when it tries to 
> send the message out.
>   
This can be done by scripting when the REGISTER message is processed and 
one could use a registry flag to tag the contact as nated".
> The 2.0 design will solve this problem as the async model will not be 
> affected by the blocking to a natted destination.
>   
Yes but it will issue TCP connection nevetheless, connections that are 
bound to fail. Maybe we should see if there is a way to tell the TM module:

"try to reuse a TCP connection to this UA and if no such connection is 
available, report an error".
> Regards,
> Bogdan
>
> Emmanuel BUU wrote:
>   
>> Hello,
>>
>> Is there a way in the TM module to prevent opensips to open an outbound 
>> TCP connection in case the destination is nated?
>>
>> Emmanuel
>>
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>>
>>   
>>     
>
>
>