GRUU and Mid-Dialog Requests

Is it just me or does something sound fundamentally wrong to
call a GRUU
an AOR?

I thought it was that Contacts are registered to AoRs, and
GRUU was just
one type of Contact address, where an AoR can map to
multiple Contacts,
zero or more of which may be GRUUs.

Mike


> -----Original Message-----
> From: Xavier Marjou [mailtoavier
.marjouorange-ft.com] 
> Sent: Friday, August 25, 2006 5:07 AM
> To: sipietf.org
> Subject: Re: [Sip] GRUU and Mid-Dialog Requests
> 
> I'm still not 100% convinced that extending the scope
of the 
> remote target
> (ie: Contact header field) to carry a gruu URI is
necessary. 
> 
> What about the following alternative mechanism: 
> 
> - UA X obtains a GRUU AOR (eg: sip:ua-x;gruu=xyz)
either by a 
> response to a REGISTER request or by an external means.
> 
> - UA X must register his GRUU AOR before using it (as
it 
> recognize a gruu aor, the registrar only accepts one 
> address-of-contact, so that forking towards multiple
contacts 
> is not possible)
> 
> - UA X can then use its GRUU AOR in its From header
when 
> sending an "initial" request, or substitute
his AOR with its 
> GRUU AOR in the To header when receiving an
"initial" request. 
> 
> In this case, mid-dialog requests are not impacted.
Moreover 
> the anonymous property of the GRUU AOR may be left out
of the 
> GRUU spec, as it comes back to the general usage in
From and 
> To headers.
> 
> Xavier
> 
> 
> 
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On Aug 25, 2006, at 10:54 AM, Michael Hammer ((mhammer))
wrote:

> Is it just me or does something sound fundamentally
wrong to call a  
> GRUU
> an AOR?
>
> I thought it was that Contacts are registered to AoRs,
and GRUU was  
> just
> one type of Contact address, where an AoR can map to
multiple  
> Contacts,
> zero or more of which may be GRUUs.
>

That's consistent with my view of GRUU.

I see a GRUU as an alias for a Contact URI  that can be used
in place  
of a Contact URI. As such, a GRUU is a URI, but not an AOR.

It's important to understand the the GRUU, while we use the
word  
"Global", isn't necessarily global. All we can
be sure of is that the  
GRUU is valid in the "external" context of the
node assigning the  
GRUU. This is important, because in many scenarios, that
node also  
has an "internal" context, and the Contact URI
used for registration  
is probably valid only in that internal context.  Of course,
if the  
external context happens to be "the Internet",
then we're pretty  
close to globally routable, but the GRUU mechanism is still
useful  
even in cases like enterprises with internal NATs.

But GRUU sounds much cooler than ERUU to a native English
speaker (or  
to a player of adventure games who has been eaten by a grue
too many  
times).

--
Dean

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Sip mailing list  https://ww
w1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementorscs.columbia.edu for questions on current
sip
Use sippingietf.org for new developments on the application of
sip