Hi Chris,
Just to add a note the great info from Sankar and Brandon . Have a look at all the settings such as schedule, times, retries etc. Have a look;
Subscriber Message Notification Settings
Cisco Unity can notify a subscriber of new messages by calling a phone or pager, or by sending an e-mail. Message notification settings allow you to control how and when Cisco Unity notifies a subscriber of new messages. You can set up notification for subscribers by using the Cisco Unity Administrator, and subscribers can set it up themselves by using the Cisco Unity Assistant, if available. (Note that in version 3.1 and earlier, the Cisco Unity Assistant was known as the ActiveAssistant, or AA.) Subscribers can also enter the phone number and status of four of the notification devices home phone, work phone, spare phone, and pager by using the subscriber phone conversation.
To set up message notification, you select a notification device phone, pager, or text pager and enter a phone number or e-mail address, as appropriate. The settings for each device allow you to control when and how notifications are sent to the first and subsequent devices. Generally, you adjust message notification settings on the message notification page of a specific subscriber and not in the subscriber template. However, you may want to enter notification settings in the subscriber template if, for example, you want to set up "chaining" or "cascading" message notification for an entire department of new subscribers.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_administration_guide_chapter09186a008014f9de.html#1150594
Hope this helps!
Rob
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