Summary
Cisco Unity Connection provides two methods for automatically deleting messages from user mailboxes:
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Message aging determines when messages are automatically deleted for each user based on which message aging policy is assigned to the user.
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Message expiration automatically replaces .wav files with a generic "this message has expired" recording when the corresponding message has reached a specified age in days. This is a system-wide setting.
To create an archive of messages that you want to retain after they would otherwise be automatically deleted:
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Create one or more new users whose mailboxes will be used for archiving messages. For example, you might create a second mailbox for every user whose messages you want to archive, or you might create a mailbox for an entire department.
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Create a message-aging policy that does not age messages, and assign this policy to all of the mailboxes in which you want to archive messages past their automatic deletion date.
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Use the CUMI API to forward the message to the applicable archive mailbox, and set the InvestigativeHold flag for the message to 1 by adding the following to the message resource:
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Messages marked for investigative hold are not subject to message expiration.