> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Paul Kyzivat > Sent: Monday, February 18, 2008 2:27 PM > To: SIP IETF > Subject: Re: [Sip] [Enum] FW: > I-DAction:draft-schwartz-sip-e164-ownership-00.txt > > Nice draft. > > One thing this highlights is that even if we solve the > identity problem > for E.164 numbers in sip-sip cases, the identity problem will > remain for > the pstn-sip case. > > The solutions for the sip-sip case will presumably require > that somebody > actually *know* the sender is the owner of the number. The GW in a > pstn-sip call will in general not know that. In reality the > callerid in > pstn calls cannot be trusted, so a true assertion of it > cannot be done > with a pstn source. Yet from a practical perspective most > will consider > a pstn assertion of identity to be something they want to know about. > > That suggests to me that a weaker form of assertion is needed in that > case, and that for suitably smart phones different forms of callerid > presentation be used in those cases, reflecting the degree of > confidence > in the value being presented.
The PSTN's assertion of identity using CLID (which is the PSTN's user-asserted identity) is as valuable as SIP's "From:" (which is SIP's user-asserted identity). The PSTN's assertion of identity using ANI (which is the PSTN's network-asserted identity) is as valuable as SIP's "P-Asserted-Identity:" (which is SIP's network-asserted identity). A PSTN->SIP gateway would not want to, and MUST NOT, attempt to provide a stronger assertion of identity because the PSTN itself has very a weak identity model (transitive trust). -d > Thanks, > Paul > _______________________________________________ > Sip mailing list http://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 _______________________________________________ Sip mailing list http://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
