Fortinet fortivoice Administrator's Manual page 199

5. Click Create.
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Warning message If you select Allow with warning or Deny with warning in the
Action field, select the sound file for the warning. Click Edit to
modify the selected file or click New to configure a new one.
For more information on sound files, see
and music on hold" on page
Delay Optionally, if you want to discourage certain users for making
outbound calls, enter the call delay time in seconds.
Page 199 FortiVoice Enterprise Phone System 4.0.0 Administration Guide
"Managing sound files
113.