Which series of commands secures the router from the hackers?

Hackers are sending calls through a gateway router that is running SIP. The engineer blocks all SIP messages to the router except from their SIP server, which has an IP address of 208.177.10.1. The customer also must connect via SIP to their Cisco Expressway server with an IP address of 10.1.10.110. Which series of commands secures the router from the hackers?
A. voice service voip voip security allow ipv4 208.177.10.1 255.255.255.255 ipv4 10.1.10.110 255.255.255.255
B. voice service
voip ip address trusted list
ipv4 208.177.10.1 255.255.255.255
ipv4 10.1.10.110 255.255.255.255
C. voice service voip
allow-connections sip to sip
ipv4 208.177.10.1 255.255.255.255
ipv4 10.1.10.110 255.255.255.255
D. voice service voip
address-hiding
ipv4 208.177.10.1 255.255.255.255
ipv4 10.1.10.110 255.255.255.255

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One thought on “Which series of commands secures the router from the hackers?

  1. Answer B:
    B. voice service voip (Enters voice service voip configuration mode.)
    ip address trusted list (Enters ip address trusted list mode and allows to manually add additional valid IP addresses)
    ipv4 208.177.10.1 255.255.255.255
    ipv4 10.1.10.110 255.255.255.255

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