6bf131c7__x____About_Licenses___DocWiki__Description
[License] maxvoice [Description] 
The maxvoice license denotes the maximum number of voice licenses that can be used for scheduled and reservationless meetings on this particular system. If the voiceconf license count exceeds the value of the maxvoice license, the system uses the value of the maxvoice license instead. The value of the maxvoice license is the absolute system limit for voice conferencing. Any maxvoice license limitations for your system appear in the Comment field on the Licenses Summary page. To find this page in the Administration Center, see the Displaying Licenses. Restriction: If you purchase and install a new maxvoice license, it overwrites the old one. The new port count is not added to the previous port count.
Cisco Unified MeetingPlace Express, Release 2.x -- About Licenses - DocWiki