Subpoena the phone company. The subpoena should list the day and time of the call. They'll supply full logs to the court. These logs will include real originating and terminating information, not the fake information that Caller ID provides.
I think you'd be surprised how effective it can be. It's worth a couple afternoons off. I have sued spammers on numerous occasions and it has always been great fun.
-scott
Yes, but that's fine, because the only time you really need that information is when you're going to court anyway. Go to the clerk's office, pay your ten bucks and get the information.
--scott
Surely someone who reads the telcom digest knows about ANI, and annoyance call trace? *
The telemarketers have to subscribe to a database that identifies whether a given number is a wireless number and thus forbidden for sales calls. Here's an example:
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