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NEW QUESTION 381
Users have been reporting unusual automated phone calls, including names and phone numbers, that appear to come from devices internal to the company. What of the following should the systems administrators do to BEST address this problem? (Choose two.)
A.   Add an ACL to the Firewall to block VoIP.
B.   Change the settings on the phone system to use SIP-TLS.
C.   Have the phones download new configuration over TFTP.
D.   Enable QoS configuration on the phone VLAN.