Re: [Sip] Comment on DERIVE and B2BUAs

["Dan Wing" <dwing at cisco.com>]

> Which is why identity is always transitive in nature . . .

The post office provides reliable forward routing, even 
across service providers (countries).  So do ISPs.  And 
the PSTN.

In all those cases, the only thing the recipient knows 
is the last hop:  the mail delivery person, their local
Internet access provider, or their local phone company
said "here is your [package | packet | phone call]".

If you want to verify its claimed "From:", a technology
appropirate to that communication mechanism is necessary:
A wet signature (post office), a certificate (ISPs), or 
the other person's voice (PSTN).

SIP provides reliable forward routing, too.  I don't
see a consensus forming that we want to utilize SIP's
reliable forward routing to build a verification system.
That is a shame, because the SIP working group's 
unwillingness to build a verification system for SIP will 
keep SIP locked inside of small networks instead of 
allowing SIP to grow and to run on the Internet.

-d

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