Clear-Com Eclipse-Omega - Manual (Page 200)

Clear-Com
Eclipse Configuration Software Instruction Manual
5 - 9 0
This allows the system to set a tally (flashing LED) on all the panel
keys that are assigned to the Party Line whenever a talk is active on
the Party Line. In the case of multiple matrices in a linked set the ‘In
Use’ tally is broadcast to all other systems in the linked set. In this
way the feature is seamless over the matrices in a linked set.
The default is disabled.