Customer Portal: Web based user interface that allows users to configure their PBX, create call queues and groups, view call detail records and billing information, listen to and delete your voicemail, upload music on hold
Top Level Auto Attendant (Always On): Allows callers to select from menu options using a standard telephone keypad. Through the portal interface, calls can be routed to extensions, mailboxes, groups, conference rooms, call queues, or unlimited depths of additional auto attendants
Multiple Top Level Auto Attendants (Always on): Each Auto Attendant is configurable individually
Top Level Auto Attendant (Time Based): Available after N rings or based on time of day
Sub-Level Auto Attendants: Sub-Level Auto Attendants are often used for different departments within an organization. For instance, you may have a main Auto Attendant for the company, and then a sub-level Auto Attendant for Sales, Support, etc