[OpenSIPS-Users] Hairpin routing and Loop avoidance

[Adrian Georgescu]

Another way to solve this is to bypass the bug by using two separate  
Asterisk instances, one for inbound and one for outbound.

Adrian

On Jun 25, 2009, at 4:03 AM, Iñaki Baz Castillo wrote:

> El Jueves, 25 de Junio de 2009, Steve Ames escribió:
>
>>> This is a kwnown bug of Asterisk.
>>
>> Does that translate as I'm out of luck pending asterisk people  
>> fixing this,
>> or can someone point me at a workaround or the right phrase to  
>> google up
>> some additional info on the asterisk bug?
>
> Take a look here:
>  https://issues.asterisk.org/view.php?id=7403
>
> Note however that even if there are some patches supposed to fix the  
> problem,
> the fact is that it has been never checked that them work correctly  
> (in my
> tests it just doesn't work at all). The "closed" status of the bug  
> means
> *nothing*.
>
> Some Asterisk's developers involved in fixing this issue have proved  
> not no
> have enough knowledge of SIP (specially in some core sections of RFC  
> 3261) as
> you can realize by reading some comments in the bug report.  
> Sometimes they
> prefer to invent "how SIP works" instead of reading the RFC (i.e.  
> CANCEL
> To_tag in parallel forking, comparision of SIP URI's...).
>
> Asterisk is not friend of "advanced" SIP features as forking.
> Also, it doesn't seem that Asterisk developers care a lot this kind  
> of issues
> not related to SIP "just for phones".
>
> I wouldn't expect this issue being "sometime" fixed. In order to  
> send back an
> INVITE to Asterisk you need a B2BUA (so From/To tags and Call-ID are  
> different
> in the request arriving to Asterisk).
> A solution could be using SEMS as transparent B2BUA (without  
> handling media).
> This is possible with an example module provided in default SEMS  
> installation.
> Other solution could be using Sippy B2BUA.
>
> Note that I don't mean removing OpenSIPS. What I mean is:
>
>  Asterisk ---------> OpenSIPS ----------> B2BUA
>      <--------------------------------------
>
>
> Regards.
>
>
>
> -- 
> Iñaki Baz Castillo <ibc at aliax.net>
>
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