NEC UNIVERGE UM8000 User Manual page 316

Delayed Messages
You might receive a complaint about new messages being delayed or arriving late in a voice mailbox.
Although it might sometimes appear that the messaging system is delaying the delivery of a new message, the system
never holds a new message for delivery at a later time unless a caller selects the Future message delivery setting.
Perceptions of delayed or late messages are real and should be taken seriously. Something is happening that causes the
subscriber to think that messages are being delayed.
The following might help you investigate and resolve delayed message reports.
Check the Clock Settings
Make sure that the clocks in the office, the computer, and the subscriber's wristwatch agree with the messaging system
server clock.
Check to see if the messaging system has ever been logged on to another server, for example, for a backup over the
network. If your network logon script is set to synchronize the time settings, the LAN server could be changing the clock
setting when the messaging system logs on.
Related Topics
Message Notification Delays
Troubleshooting
Troubleshooting 316