> 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 _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
