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

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.

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