What prevents toll fraud on voicemail ports?

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What prevents toll fraud on voicemail ports?
A . IP address trusted list on the PSTN gateway
B . CSS
C . Block OffNet to OffNet Transfer service parameter
D . FAC

Answer: B

Explanation:

Reference: https://www.cisco.com/c/en/us/support/docs/unified-communications/unity-connection/119337-technote-cuc-00.html

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