Cisco 400-051 Exam

Which two security services are provided by the Phone Proxy function on a Cisco ASA appliance? (Choose two.)

  • A. It provides interworking to ensure that external IP phone traffic is encrypted, as long as the Cisco Unified Communications Manager cluster runs in secure mode.
  • B. It only applies to encrypted voice calls where both parties utilize encryption.
  • C. It manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.
  • D. It supports encrypted TFTP operation of IP phone configuration files.
  • E. It intercepts and authenticates soft clients before they reach Cisco Unified Communications Manager clusters.
  • F. It requires a remote routing device with an IPsec VPN tunnel.
Answer: Option C. E.
Explanation: 

When using TLS Proxy, the Cisco ASA appliance is inserted between the phones and Cisco Unified Communications Manager. The phones will now establish a TLS session with the ASA appliance. The appliance will, in turn, establish a proxy TLS connection with Cisco Unified Communications Manager on the phone’s behalf. This function generates two TLS sessions.

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