On Tue, Oct 07, 1997 at 11:43:24AM -0700, ken emery wrote:
One question, "can't the sender (aka the person initiating the call) forge the ANI information?" I know on a cisco (1003 series) it will croak if this is incorrect, but what about an Ascend or other ISDN device? Unless things have changed I don't think the TELCO's in the USA guarantee the ANI is correct.
In short: no. It's exceptionally difficult to forge ANI, with one small exception. _Some_ originating end-offices apparently don't validate ANI information handed to them by PBXs... otherwise, spoofing ANI requires intercepting the loop to the receiving sub, or subverting the switch. This was discussed at length in one of the telecom newsgroups, about 4 months ago, search for "ANI spoof" or "CNID spoof". Cheers, -- jra -- Jay R. Ashworth jra@baylink.com Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "People propose, science studies, technology Tampa Bay, Florida conforms." -- Dr. Don Norman +1 813 790 7592