Now, repeat this experience at work. Big difference.
> -----Original Message----- > From: Dean Willis [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 20, 2008 14:17 > To: Paul Kyzivat > Cc: Audet, Francois (SC100:3055); IETF SIP List; > [EMAIL PROTECTED]; Henry Sinnreich; Elwell, John; Richard Shockey > Subject: Re: [Sip] Infrastructure issues involving e164 numbers > > > On Feb 20, 2008, at 4:00 PM, Paul Kyzivat wrote: > > > > > > > Francois Audet wrote: > >> I think it's time for a reality check... > >> > >> In the PSTN, if you are an enterprise and have a trunk to > a service > >> provider, you can pretty much put whatever you want in the Calling > >> Party Number (you can't do that from home with an > individual line as > >> the CO puts the Calling Party Number for you). The network > will pass > >> it for you to the other end. > > > > Why hasn't somebody sued a SP for providing false identity??? > > > > The SP *should* be restricting what the enterprise can put based on > > the numbers that the SP knows belong to the enterprise. (The SP > > doesn't need to care if the number is the precise one > originating this > > call.) > > > > But I knew this. In principle the reliability of the pstn > callerid is > > nonexistent. But because it is somewhat difficult for most users to > > spoof, *on average* callerid is reasonably reliable. Enough so that > > many can/do make use of it. > > > > (Admittedly the ease of spoofing is increasing, and so the average > > reliablility of callerid is probably going down.) > > It's also because the telephony service provider has > additional logging records that can be used to back-trace the > call if it turns out to have been fraudulently identified. > > Try this experiment: Take your home ISDN BRI line. Add your > own terminal adapter with POTS interface (if you don't have > one, I'll be happy to sell you one of mine -- I have several > that need to be eBayed). Dummy up your CPID field to whatever > you want (this works, at least here on Verizon lines). Now > place a crank call to somebody very important, and see how > long it takes for the authorities to show up . . . > > -- > Dean > _______________________________________________ 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
