Can audience keypad ID get reassigned if the keypad got switched off and on again? Can we then reconnect a different base station or obtain a different keypad ID?

If you use static address mode then the keypad ID and base channel will not be lost when you power off the keypad. When you use dynamic address mode, Power off and then power on the keypad, then the keypad id may be re-assigned to the next available address when you connect to the base station. PowerCom can store the keypad ID when you use dynamic address mode, in case the keypad gets powered off during the meeting. When audience power on the keypad again, PowerCom will remember the originally saved keypad ID, and will not allow base station to re-assign new keypad ID. Please review online help topic “Save keypad list” in the Reply Plus base settings, address mode section for more information.