[OpenSIPS-Users] Hairpin routing and Loop avoidance

Adrian Georgescu ag at ag-projects.com
Thu Jun 25 06:26:31 CEST 2009


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>
>
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users




More information about the Users mailing list