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RE: [Simple] Inter-domain Requirements for SIMPLE

The connection between the watcher (the real end user) to the PS of the presentity can be comprised of two logical hops.
The access hop (between the watcher and its PS) is using SUBSCRIBE as is but the PS actually terminates the SUBSCRIBE dialog.
The interdomain hop (between the PSs) needs to use extended/modified SIMPLE mechanisms (pending requirements validity).
 
I hope it clarifies one of the possible "architectures" to achieve the optimizations.
Orit.
From: Alex Audu [mailto:alex.audu@alcatel.com]
Sent: Thursday, February 26, 2004 8:22 AM
To: Orit Levin
Cc: Robert Sparks; IETF SIMPLE WG; Avshalom Houri
Subject: Re: [Simple] Inter-domain Requirements for SIMPLE

Orit,

This seems like a mechanism to optimize information trasnfer between a watcher's PS and
the remote PS containing the presesnce information of interest.  But the requirement is
specifying the possibility of "requesting" access to information "without subscribing " to it.
The common understanding in SIMPLE is you can't request for presence information without
subscribing to the presentity.   If you request for it, you must have subscribed to it. But you
don't want to be  transfering information to an endpoint that didn't subscribe to that information
just because you want to optimize bandwidth utilization or something like that.  Or am I missing
something?

Regards,
Alex.

Orit Levin wrote:
This requirement attempts to say:

A potential watcher asks a presentity to grant access to presentity's
presence information, but the watcher (or more precisely, its PS) is not
interested in the presence information being pushed on individual basis
from this point on. In other words, it can be implemented by just adding
the watcher to presentity's ACL. Or in case of groups, adding the
requesting watcher to a specific group.

Orit.

-----Original Message-----
From: Robert Sparks [mailto:rsparks@dynamicsoft.com] 
Sent: Wednesday, February 25, 2004 8:48 AM
To: Orit Levin
Cc: IETF SIMPLE WG; Avshalom Houri
Subject: Re: [Simple] Inter-domain Requirements for SIMPLE

Orit, Avshalom -

Thanks for submitting this draft. You've captured some
important thoughts around deploying presence systems that
deserve attention. I particularly look forward to the
discussions we'll have around section 7.3 (Grouping of
Watchers for SHARING of Presence Info).

One quick question: I don't understand what you're looking
for with the first requirement of 7.1:

   o  Presence access: It MUST be possible to request continuous
      access to the status of a remote presentity without
      "subscribing" to it.

Could you explain this a little more?

RjS

On Mon, 2004-02-23 at 17:33, Orit Levin wrote:
  
Guys!
We have submitted a requirements document for secure and efficient
transfer of presence information over inter-domain links.
Please, take a look at our thoughts and suggestions:
 

    
http://www.ietf.org/internet-drafts/draft-levin-simple-interdomain-reqs-
00.txt
  
 
We look forward to your feedbacks on how we can enhance SIMPLE to
support these directions.
 
Thanks,
Orit.
    


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