Which two of these configurations must be applied when dialing from an IP endpoint to an
ISDN destination? (Choose two,)

A.
Gateway service numbers should mimic incoming PSTN routing methods.

B.
The Cisco Telepresence Software Version TC4.0 protocol is required.

C.
DID trapping must be configured on the ISDN gateway.

D.
A prefix must be registered with the gatekeeper.

Explanation: