Number of DSS keys enlarged for OpenStage 60/80

On OpenStage 60 and OpenStage 80 the number of FPK keys that can be configured as multi-line or DSS keys is limited to 30. On OpenStage 15 and OpenStage 40 the number of FPK keys that can be configured as multi-line or DSS keys is limited to 18.

Key module are not hot pluggable. The phone is required to be completely powered off before the side car can be plugged in.