[320] in Cypherpunks
Re: CALLER ID?
daemon@ATHENA.MIT.EDU (Phil Karn)
Wed May 12 19:11:11 1993
Date: Wed, 12 May 93 15:49:48 -0700
From: karn@qualcomm.com (Phil Karn)
To: cypherpunks@toad.com, eaeu362@orion.oac.uci.edu
Interesting. As expected, when I called 1-800-235-1414 from a PBX
extension here at work, it read back the trunk number, not my actual
extension number. The same for a developmental CDMA digital
cellphone, since we use PBX-style trunks from our switch.
But when I called it from a conventional AMPS (FM) cell phone using
Pac Tel Cellular, I also got a number that was different than my
mobile's real number. And when I called it back, I got a
number-not-valid intercept.
Interesting. Apparently one real cellular switch also looks like a PBX
as far as ANI goes. I wonder how widespread this is. Anybody with a
cell phone on a service other than Pac Bell who is willing to give it
a try?
Phil
