Hi Attila,

sorry maybe I wasn't clear in my question.

My problem is:
I send out a MESSAGE to a AoR, and I want be sure that the receiver of 
the MESSAGE
(if he wants to reply to the MESSAGE) will send out the reply to the 
same UA I used to send out the MESSAGE.
Now, how is it possible if I can not insert a Contact header with my 
GRUU within the MESSAGE ?

/sal

Attila Sipos wrote:
> You can use gruu in any non-REGISTER request.
>
> You don't need an INVITE, you only need to REGISTER the UA
> to get a gruu.
>
> from http://www.jdrosen.net/papers/draft-ietf-sip-gruu-13.txt :
>
> 3.3.  Using a GRUU
>
>    Once a user agent obtains GRUUs from the registrar, it uses them in
>    several ways.  First, it uses them as the contents of the Contact
>    header field in non-REGISTER requests and responses that it emits
>    (for example, an INVITE request and 200 OK response). 
>
> Regards,
> Attila
>
>  
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
> Salvatore Loreto
> Sent: 07 February 2008 11:40
> To: [email protected]
> Subject: [Sip] gruu and SIP MESSAGE
>
> Hi,
>
> I haven't found any references that GRUU can be used in SIP MESSAGE.
> So, how do I ensure routing back to a specific client for SIP MESSAGE,
> without be forced to associate a MESSAGE with an existing INVITE?
>
> regards
> Sal
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