What prevents toll fraud on voicemail ports?

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

View Answer

Answer: B

Explanation:

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