About this task
With Call Detail Recording (CDR) activated for the incoming trunk
groups, you can find out details about the calls made into your voice
mail ports.
Review CDR reports for the following indications
of possible voice messaging abuse:
Short holding times on any trunk group where voice messaging
is the originating endpoint or terminating endpoint
Calls to international locations not normally used by your
business
Calls to suspicious destinations
Numerous calls to the same number
Undefined account codes