Voicemail Pro is enable by the addition of the following licenses.

Preferred Edition (Voicemail Pro) :
This license enables support for Voicemail Pro as the IP Office's voicemail server with 4 voicemail ports.  The Preferred Edition license allows the voicemail server to provide the services listed below. For IP Office Release 8.0 and higher, an Essential Edition license is a pre-requisite for this license on IP500 V2A systems.

Mailboxes for all users and hunt groups.

Announcements for users and hunt groups.

Customizable call flows.

Call recording to mailboxes.

Campaigns.

TTS email reading for users licensed to Mobile Worker or Power User profiles. Also requires TTS licenses.

Use of Conference Meet Me functions.

Database access

1.A Preferred Edition system license is a pre-requisite for any user profile license other than Basic User.

In a Small Community Network, the Preferred Edition license of the central system is automatically shared with other systems in the network, enabling user profile licenses on those other systems. However, each system supporting a Voicemail Pro server, for example for distributed voicemail, still requires its own Preferred Edition license.

Preferred Edition Additional Voicemail Ports
The required license for Voicemail Pro server support (Preferred Edition (Voicemail Pro)) also enables 4 voicemail ports. These licenses can be used to add additional voicemail ports up to the maximum capacity of the IP Office system (IP500 V2A = 40). This license was previously called Additional Voicemail Pro (ports). These licenses are available in 2, 4, 8 and 16 port variants which can be combined for the total number of ports required.

Media Manager
Allows the use of Media Manager on an IP Office Application Server to provide long term archiving of call recordings. In a Small Community Network, each IP Offices requires its own license.

VMPro Networked Messaging
Enables VPNM (Voicemail Pro Networked Messaging) functionality within Voicemail Pro. This allows message exchange with remote Voicemail Pro systems and Avaya Interchange systems.

VMPro TTS (Generic)
This legacy license enables the use of text to speech facilities using third party TTS software with Voicemail Pro on a Windows server. One license per simultaneous instance of TTS usage. Note that the IP Office Advance Edition license also enables 8 ports of generic TTS but useable with Speak Text actions only.

VMPro TTS (ScanSoft)  
This legacy license enables the use of text to speech facilities using Avaya supplied TTS software with Voicemail Pro on a Windows server. One license per simultaneous instance of TTS usage.

VMPro TTS Professional  
This license enables the use of text to speech facilities provided by Voicemail Pro on a Linux based server. One license per simultaneous instance of TTS usage.

UMS Web Services
These licenses are used to enable UMS voicemail services support for users set to the Basic User profile. Other users are enabled for UMS through their licensed user profile. These licenses are also used to license hunt groups for UMS voicemail services. Each license enables 1 user.