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Write a query that compares the CDR to the recordings in the server folder. If there is a record without a recording, you can investigate.
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Write a new feature code for the receptionist to use that logs the relevant information you want to collect before triggering the normal *1 feature code.
Feature Codes Admin User Guide - PBX GUI - Documentation (freepbx.org)
Defining custom feature codes - FreePBX - FreePBX Community Forums