An engineer is configuring toll fraud prevention on a Cisco Unity Connection system.

Toll fraud prevention on Cisco Unity Connection often involves restriction tables, which define patterns of phone numbers that are allowed or disallowed. To prevent users from dialing out using trunk access codes and potentially making unauthorized long-distance calls, here's the logic:

Identify trunk access codes: Determine the specific codes that allow external calls on each phone system. These are often single-digit codes like "9".

Add patterns to restriction tables: Within the Cisco Unity Connection restriction tables, create patterns that block any number starting with the trunk access code for each respective phone system.