Which action is correct with respect to toll fraud prevention configuration in the Cisco Unified Communications Manager Express?
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A. B. C. D.B.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/Toll fraud is a type of fraud where an unauthorized user gains access to the organization's phone system and makes long-distance calls, resulting in substantial charges. Therefore, it is essential to implement toll fraud prevention measures in Cisco Unified Communications Manager Express (CUCME). Among the options given, only one action is correct. Let's look at each option in detail:
A. Configure Direct Inward Dial for Incoming ISDN Calls with overlap dialing: This option is not related to toll fraud prevention. Direct Inward Dial (DID) enables incoming calls to be routed directly to the extension of the called party, without the need to go through a receptionist or an operator. Overlap dialing is a feature that allows the caller to start dialing the destination number while the system is still processing the previously dialed digits.
B. Configure IP Address Trusted Authentication for Incoming VoIP Calls: This option is a toll fraud prevention measure that allows CUCME to authenticate incoming VoIP calls from trusted IP addresses. When enabled, incoming VoIP calls from untrusted sources will be rejected by CUCME, thus preventing toll fraud.
C. Configure the command no ip address trusted authenticate under "voice service voip": This command disables the IP Address Trusted Authentication feature, which is the opposite of what is required for toll fraud prevention. Disabling this feature means that incoming VoIP calls will not be authenticated, which could potentially allow unauthorized access to the phone system and result in toll fraud.
D. Enable Secondary Dial tone on Analog and Digital FXO Ports: This option is not related to toll fraud prevention. The Secondary Dial Tone feature provides a dial tone to the user after lifting the handset, indicating that the phone is ready to receive input. It is useful in situations where the user needs to enter additional digits to complete the call, such as when dialing an external number that requires an access code.
Therefore, the correct answer is B. Configure IP Address Trusted Authentication for Incoming VoIP Calls.