I just got the whole caller ID process to me from one of my co-workers. Kinda nifty I think. Just an FYI, if your local telephone company has caller ID, you're caller ID info is always sent out from the local company to the place you are calling. The local telephone company of the person you are calling, if they don't have newer telephone switching equipment, will send the Caller ID info even if you have a feature that blocks the sending of it.
As for telemarketers, as someone said about, the Digital Trunks don't get the Caller ID stuff. The telemarketers buy their lines from Long Distance carriers or some crap like that I think my co-worker said.
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