When troubleshooting an MWI issue in Cisco Unity Connection, which task should you perform in the phone system component at the beginning of troubleshooting?

Verifying MWI is enabled for the user is a user-level configuration check, not a phone system component-level task performed at the start of troubleshooting.

Confirming the correct phone system is assigned to a user is a user account setting, not the initial step taken within the phone system component itself.

Running the Check Telephony Integration test is the recommended initial diagnostic action at the phone system level in CUC because it verifies the SCCP or SIP integration between CUC and Cisco Unified Communications Manager is functional. This test confirms that basic signaling is working before investigating user-level or port-level configuration issues.

Checking port MWI-only configuration is a port-level verification step done after confirming the overall telephony integration is functioning.

Verifying the pilot number matches the CUCM configuration is a configuration audit step, not the first active diagnostic test recommended at the phone system component level.