asterisk users - Jan 2013 - How to exclude non-queue calls from recording ?

Hi,

Let say we have a call center from which agents get calls from both
"on-queues" and "off-queues" calls (ie calls passing through
queues or
direct calls non passing through queues).
Regulation here specify prior consent before recording call.

How can I best enforce this compliance ?
What would you suggest ?

I have thought about the following solution:
Have a cron script that, reading CDR files, checks if a call both did not
enter a queue and has a recording file, if positive, remove this recording
file.

Cheers
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