Re: [dispatch] Comments on draft-lawrence-sip-3rd-party-authorization-00

["Dale Worley" <[e-mail]>]

On Mon, 2009-05-18 at 11:24 -0700, Alan Hawrylyshen wrote:
> p.5 § 2.2 par 10
> 
> This hints at a much larger problem in SIP.
> Can Bob determine from Alice's subscription requests the (minimum)
> degree of disclosure required to satisfy Alice's interests? How can
> Bob know the application of the information requested. As you indicate
> later in the draft, this remains a significant challenge, although it
> is quite likely outside the scope of your draft. The JOIN vs 'line in
> use' indications being a great example of the two extremes.

I'm not sure that this is a problem in quite the way you write it.

All that is needed, I think, is for Bob to determine the information
which Alice is authorized to see.  From that information, Alice can
determine if that is enough information to satisfy her interests.

This approach avoids Alice having to be able to declare her interests,
and Bob having to interpret the declaration.

What makes the problem messy is if the question of what Alice is
authorized to know is variable or duration-sensitive.

Dale