Secure FreePBX ChanSpy

By default, ChanSpy, a supervisor function that allows you to monitor
other peoples calls, is enabled and can be used by anyone, yes, anyone, who's phone is logged in to a FreePBX system that has this feature enabled.
Sangoma don't allow you to secure it out of the box, instead, they try sell you some commercial module (that's about AU$145) that allegedly sets a PIN. But you can do it for free!
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