Which action is required if an engineer wants to have Cisco Unified Communications Manager configuration for an MGCP gateway?

Uploading custom configurations to a TFTP server is generally for IP phones or specific device configurations, not for initiating MGCP gateway control by CUCM.

Configuring CUCM's IP in voice service voip is relevant for H.323 or SIP gateways, not for establishing MGCP control.

MGCP gateways are controlled by CUCM, and the ccm-manager commands on the gateway tell it which CUCM server to register with and receive its configuration from, enabling central management. This command specifically configures the gateway to retrieve its configuration and call control instructions from Cisco Unified Communications Manager.

While a gateway is added in CUCM, checking an 'auto-configuration' box on the CUCM side doesn't directly configure the physical gateway device itself to register; the gateway needs explicit commands.