Which two additional items can be configured for an endpoint to register with the Cisco TelePresence Video Communication Server for H.323 to function correctly? (Choose two.)

A unique system ID is an internal device identifier and is not a required parameter for H.323 gatekeeper registration on the VCS.

The H.323 ID is the primary alphanumeric identifier used by H.323 endpoints to register with and be reached through the VCS gatekeeper; it uniquely identifies the endpoint within the H.323 zone and is mandatory for gatekeeper registration.

A unique DNS entry ID is not a defined H.323 registration parameter; H.323 registration uses H.323 IDs and E.164 aliases, not DNS-based identifiers.

The E.164 alias is the numeric dial string (similar to a phone number) that allows other endpoints to dial this endpoint using digit-based addressing; without it, numeric dialing through the VCS gatekeeper will not function.

RTP port numbers are used for media transport after a call is established and are not required configuration items for H.323 gatekeeper registration.

An NTP server IPv4 address is used for time synchronization and has no role in H.323 gatekeeper registration with the VCS.