6bf131c7__x____About_Licenses___DocWiki__Description
[License] voiceconf [Description] 
The voiceconf license limits the number of concurrent voice participants for premium (scheduled) meetings, including: Calls to and from the system Voice participants in meetings The available number of voice ports may be further limited by the maxvoice license. If you do not install the voiceconf license, the system can use only the six trial voice ports for premium (scheduled) meetings. Requirement: To enable the system to use the voiceconf license for premium (scheduled) meetings, you must install the systemsoftware license.
Cisco Unified MeetingPlace Express, Release 2.x -- About Licenses - DocWiki