Re: Caution: Unidentified Callers Ahead

Thor Lancelot Sim>> >>> I suspect from the way current VoIP calls are structured that it would be
>>> (a) very easy to spoof the number, >>> (b) impossible to enforce upon overseas numbers and >>> (c) too easy to make the number unavailable in the first place. Heck, >>> even the doctor's office number is "unavailble". >> This is all false. Why do we have this same discussion over and over >> again every few months? > Well, you don't say where you think you got your information.

I got it from 10 years of design and analysis experience with the underlying protocols; that it is impossible to "spoof" calling party ID in properly configured SS7 networks whose operators do not configure trunks to _customers_ as if they were trunks to _network equipment_ is simply a matter of fact.

As all the interworking standards make clear, any interworking to a protocol which does not differentiate between customer-provided and network-provided calling party identification must either use the supplied number as a customer provided number only, or replace it with the BTN for the trunk.

Thor Lancelot Simon snipped-for-privacy@rek.tjls.com

"We cannot usually in social life pursue a single value or a single moral aim, untroubled by the need to compromise with others." - H.L.A. Hart