Ok, so let say we see (after usrloc lookup) that we have to use tcp
(looking at RURI param) and also we can inspect the bflag for nat
indication.
From this point I see two options:
- expose a TCP related function to be called from script to check if
there is an opened connection to a certain destination (like RURI) -> if
false, drop the call
- invent a new flag to instruct the TCP layer not to open a new
connection - probably a script flag, as the sip_msg struct is not
passed to the transport layer. In this case, the error will be reported
by t_relay()...a bit ambiguous ..
Regards,
Bogdan
Emmanuel BUU wrote:
> 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
>>>
>>> _______________________________________________
>>> Devel mailing list
>>> Devel@lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/devel
>>>
>>>
>>>
>>>
>>
>>
>
>
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>
>
--
Bogdan-Andrei Iancu
www.voice-system.ro
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