Which three integration methods between Cisco Unity Connection and Cisco Unified Communications Manager are valid? (Choose three.)

SIP trunk integration allows Unity Connection to register voicemail ports with CUCM using the Session Initiation Protocol, which is a fully supported and commonly deployed method.

ISDN is a WAN/circuit-switched technology and is not a supported signaling integration method between Unity Connection and CUCM.

SCCP (Skinny Client Control Protocol) is used to register Unity Connection voice messaging ports directly with CUCM, enabling call routing to voicemail.

H.323 is not a supported protocol for Unity Connection integration with CUCM; Cisco uses SIP and SCCP for this purpose.

SIP to DMG/PIMG/TIMG allows Unity Connection to integrate with legacy analog or digital PBX systems through Digital Media Gateways or PIMG/TIMG devices using SIP as the signaling protocol to the gateway.

RIP is a network routing protocol and has no role in UC application integration.

EIGRP is a Cisco routing protocol used for network layer routing, not for application-level UC integration.

IP alone is not a specific integration method; it is the underlying network layer, not a signaling or integration protocol.