Yealink VC400 User Manual page 135

Click Browse to locate the 8-way conference license (the file format must be *.dat) from
2.
your local system.
Click Upload to complete importing the 8-way conference license.
3.
To view 8-way conference license status via the remote control:
Press (Menu soft key) to enter main menu.
1.
Press or to select the Status menu.
2.
Press or to scroll to License, and then press
3.
If the 8 way MCU displays Unsupported, it means you have not imported an 8-way
-
conference license. So the system supports up to 4-way video calls and an additional
voice call (an original caller and three other sites).
Using the VC400 Video Conferencing System
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