Refer to the exhibit. Unanswered calls do not reach the voicemail associated with the phones Instead, callers receive the default greeting. Which action fixes the configuration?

Rebooting Cisco Unity Connection is a drastic step and is unlikely to fix a configuration issue related to header delivery from CUCM without addressing the underlying setting.

Reviewing conversation manager logs is a diagnostic step, not a corrective action, and while useful for troubleshooting, it does not fix the configuration issue itself.

When calls hit a default greeting on Cisco Unity Connection (CUC) instead of a specific user's voicemail, it means CUC is not receiving the Redirecting or Diversion information from Cisco Unified Communications Manager (CUCM) via the trunk. Enabling 'Redirecting Diversion Header Delivery - Outbound' on the CUCM trunk ensures this critical call redirection information is sent to CUC, allowing it to correctly identify the intended voicemail recipient, and a trunk reset is often necessary for this change to take effect.

Checking the 'Redirecting Diversion Header Delivery - Outbound' box is necessary, but without resetting the trunk, the change might not be applied dynamically, and the issue could persist until the trunk is reset.