An engineer is adding a third-party video endpoint to Cisco Unified Communications Manager. Which third-party device type should be used when adding the system?

SCCP (Skinny Client Control Protocol) is a Cisco proprietary protocol designed for Cisco-branded IP phones and is not used by third-party video endpoint manufacturers.

SIP (Session Initiation Protocol) is the industry-standard signaling protocol supported by the vast majority of third-party video endpoint manufacturers. When adding a non-Cisco video device in CUCM, selecting the SIP device type allows CUCM to use standard SIP registration, call setup, and feature negotiation for interoperability. Cisco CUCM provides SIP phone and trunk profiles specifically designed to accommodate third-party endpoints.

MGCP (Media Gateway Control Protocol) is used to control and manage PSTN media gateways, not to register video endpoints.

H.323 is a legacy video conferencing protocol, but Cisco CUCM's recommended and fully supported method for third-party video endpoint integration is SIP, not H.323.