[OpenSER-Users] Rewriting the to header

[shiebar at post.tau.ac.il]

Hi Inaki,

I am working on understand it thoroughly.
Thank you very much for your help.

Best regards,
Shie

Quoting Iñaki Baz Castillo <ibc at aliax.net>:

> El Sábado, 15 de Marzo de 2008, shiebar at post.tau.ac.il escribió:
>> Hi Inaki,
>>
>> I have already read it but probably missed this important detail.
>> Thanks for the  advice. I will read it again more carefully.
>
> In resume:
> The real destination is the Request-Uri (except if there is a   
> "Route" header).
> "To" header jist means the **original** destination. For example:
>
>
> - A calls B so it generates an INVITE like:
>   INVITE B at domain1 SIP/2.0
>   To: B at domain1
>   From: A at domain1
> (note Request-Uri = "To" header)
>
> - A sends the INVITE to the proxy responsible for domain1.
>
> - The proxy has has a diversion to C at domain2 for B.
>
> - Proxy rewrites the request-Uri and sends the INVITE to C:
>   INVITE C at domain2 SIP/2.0
>   To: B at domain1
>   From: A at domain1
>
> - The INVITE arrives to the inbound proxy of C, who rewrites the Request-Uri
> with the location of C AoR and sends the INVITE to it:
>   INVITE C at ip_c SIP/2.0
>   To: B at domain1
>   From: A at domain1
>
>
> When the INVITE arrives to C it knows that the original destination was B.
> In conclusion, the "To" header is just valid for this purpose and no more. It
> has NOTHING to do with the real destination of the call (except in the
> original INVITE in which "To" and RURI are the same).
>
>
> Hope it helps ;)
>
> Regards.
>
> --
> Iñaki Baz Castillo
>
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