[OpenSIPS-Users] BYE on 180 causing dialog loop

[Bogdan-Andrei Iancu]

Hi Saul,

Just to clarify - while the call is still in early stage, the control is 
done at transaction level (the INVITE transaction) - if transaction is 
successful (200OK) -> call established; if transaction fails (negative 
reply) -> call fails.

So, the dialog module is not interested in the CANCEL -> it will wait to 
see the feedback on the INVITE level, like the 487 reply (as a result of 
the CANCEL being accepted).

The BYE (instead of CANCEL) works in a similar way - the dialog module 
will simply wait to see what will happen with the INVITE.

So, from standard dialog state, the dialog module does not care about 
the CANCELs or BYEs in early state.

Of course, things are a bit different when using topology hiding with 
dialog module - there you have the "topo hide" the BYE also ;).....and 
this needs to be fixed

Regards,
Bogdan

On 11/17/2011 02:24 PM, Saúl Ibarra Corretgé wrote:
> Hi,
>
> On Nov 17, 2011, at 12:53 PM, Vlad Paiu wrote:
>
>> Hello,
>>
>> The problem lies in the fact that the device send BYE while the dialog was not established yet, when in fact a Cancel should have been used.
>>
> The caller MAY use a BYE instead of a CANCEL to terminate a dialog in the early stage, that is, if it received a 101-199 response with a to-tag. (RFC 3261, sec 15)
>
> Since no SIP trace was provided I don't know if that was the case. Anyway, would OpenSIPS handle that situation correctly?
>
>
> Regards,
>
> --
> Saúl Ibarra Corretgé
> AG Projects
>
>
>
>
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>


-- 
Bogdan-Andrei Iancu
OpenSIPS solutions and "know-how"