Which two of these configurations must be applied when dialing from an IP endpoint to an ISDN destination? (Choose two)
A.
A dial plan rule must be created
B.
Gateway services numbers should mimic incoming PSIT routing methods
C.
The Cisco TelePresence Software Version TC4.0 protocol is required
D.
DID mapping must be configured on the ISDN gateway
E.
A prefix must be registered with the gatekeeper