Re: [Sip] Contact header in 1xx responses/updates remote target ornot?

Dale,

Not sure if I read your comment right, but RFC3261 12.2.1.2 says

When a UAC receives a 2xx response to a target refresh request, it
   MUST replace the dialog's remote target URI with the URI from the
   Contact header field in that response, if present.
It does not say anything about 1xx responses here though...Regards,Jeroen
Dale.Worley@comcast.net wrote:
>   From: Nina Garaca <nina.garaca@zesium.com>
> 
>   Q1:  Should I expect that these responses have a Contact header?
> 
> As Paul says, if it didn't have a Contact header, it couldn't
> establish a dialog.
> 
>   Q2:  If they do so, should the remote target of the dialog be
>   refreshed by that Contact at the side that has received that 1xx
>   response and should the remote target of the dialog be refreshed by
>   the Contact in the INVITE request at the side that has received
> that INVITE? 
> 
> Responses are not "target refresh requests", so they don't change the
> target address at their end of the dialog.  But of course, the
> responses to the dialog-initiating request establish the initial
> target address.
> 
>   Q3: If not, should the remote target of the dialog be refreshed by
>   the Contact in the INVITE request
>       at the side that has received that INVITE and has sent dialog
>   establishing 1xx response?
> 
> RFC 3261 section 12.2:
> 
>   INVITE, the only target refresh request defined is re-INVITE (see
>   Section 14).  Other extensions may define different target refresh
>   requests for dialogs established in other ways.
> 
> Dale
> 
> 
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