AT&T Unified Messaging (SM)
Additional Features for your AT&T Enterprise Messaging - Unified Messaging (UM) Mailbox
AT&T Enterprise Messaging - UM subscribers are offered a variety of options with their UM mailbox. In addition to the features a subscriber receives with their UM mailbox, AT&T also offers the following optional features that customers may add on to their mailbox.
Option Notes
Secondary Phone Number
  • If a subscriber already has phone service on a second landline, they can include this phone number with their UM mailbox.
  • Note: Subscribers may have to purchase Call Forwarding features for the additional phone number. They are Call Forward Variable, Call Forward Busy Line, and Call Forward Delay.
Additional Storage
  • Initially, the storage capacity of the mailbox is 100MB. Storage can be added to the mailbox in increments of 50MB. Up to two increments can be added, for a total of 200MB of storage for the mailbox.
* Installation charges may apply