Use this option to set the Digital Pager Callback Number portion of the Message Notification callout
number for a digital pager. This is the portion of the callout number that is appended to the pager service
telephone number. Normally, this option should be X*M#, where:
- X is the number of the extension that generated the notification.
- * is a visual delimiter (to make the pager display easier to read).
- M is the number of new messages in the extension’s mailbox.
- # is the digit normally used by the pager service for positive disconnect.