On a video endpoint running TC software, which two SIP settings are the minimum needed to register the endpoint to a Cisco VCS? (Choose two.)

The SIP URI is the endpoint's identity (e.g., user@domain) and is required in the REGISTER message's From and To headers so the VCS can identify and authenticate the device.

A loginname is not a minimum SIP registration parameter on TC software; authentication credentials may be optional depending on VCS policy.

A password is only required if the VCS enforces digest authentication; it is not a minimum requirement for basic SIP registration.

An E.164 address is an H.323 concept used for PSTN-style dialing and is not required for SIP registration to a VCS.

Gatekeeper is an H.323 registration concept, not a SIP setting, and has no role in SIP endpoint registration.

The proxy address specifies the IP address or FQDN of the Cisco VCS, which is where the endpoint sends its REGISTER request - without it, the endpoint has no target for registration.

The domain can be derived from the SIP URI itself and does not need to be configured as a separate minimum setting for VCS registration.