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Practical Peripherals sells a modem that also captures Caller ID info and makes it available to your comm program. I've also seen devices that do this for sale in the back of BBS magazines.

The question is, how does a caller block this feature?

Depends on the locality, but generally you have 2 options: temporarily disable it with a *code, or get all-call-blocking. In most areas, as far as I know all-call-blocking (so you don't have to enter the *code for every call) is a "special service" or "extra feature" and costs you more. This is of course utterly ludicrous, but that's what you'd expect from semi-monopolies. -- Stanton McCandlish mech@eff.org 1:109/1103 EFF Online Activist & SysOp O P E N P L A T F O R M C R Y P T O P O L I C Y O N L I N E R I G H T S N E T W O R K I N G V I R T U A L C U L T U R E I N F O : M E M B E R S H I P @ E F F . O R G