What are the two primary roles of the PSTN and voice gateway in the Unified CCE solution? (Choose two.)

What are the two primary roles of the PSTN and voice gateway in the Unified CCE solution? (Choose two.)
A . The voice gateway may modify the digits presented to downstream devices.
B. The voice gateway provides IVR functionality in a Contact Center deployment.
C. The PSTN is responsible for delivering the inbound call to a voice gateway.
D. The PTSN is responsible for routing the call to the agent.
E. The voice gateway is responsible for routing the call to the agent.

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Answer: A, C