All Snom handsets only show this missleading lock symbol to visualize that the keylock is enabled.
However, more important would be some visualizer to display the successfully enabled SRTP encryption of ongoing calls. For this, the lock symbol would match perfect.
Could you replace the lock symbol as a encryption indicator and add some additional symbol to display the keyboard lock?
We have already opened a feature request for this request but for the time being we cannot say when this will be implemented.
internal reference number: DECT-573!
snom support team