MTA messages are accessed by a special UMR conversation while the primary Exchange server is offline. When Exchange comes back online, Unity should attempt to deliver those messages to the user's Exchange mailboxes. If that doesn't happen, you can restart the MTA service which should trigger delivery. Here is a link on UMR that might be helpful to you:
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Configuring Cloud Connected PSTN (CCP) – Easy as 1-2-3!
STEP 1: PREPARE
Before you can configure your CCP in Control Hub, you must procure PSTN services from an authorized Webex Calling CCP Partn...
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This topic is a chance to discuss more about how to read Cisco Unified Communications trace files. In this session, Cisco D...