Unify OpenStage Key Module 80

OpenStage Key Module 80 for OpenStage 80 / 80 G / 80 T Features:
- 12 additional freely programmable keys with LEDs; function, speed dial or line keys (multiple layers).
- Large graphical display for automatic key labeling.
- Available colors: ice blue, lava (OpenStage 40/60) or silver blue metallic (OpenStage 80).
- At most two Key Modules per telephone are possible. No combination with other Key Modules and OpenStage Busy Lamp Field 40.