Enables or disables Drop and Insert functionality on a
D/I WPIM. If enabled, all zero assigned timeslots will
designate D/I interface channels, if disabled all zero
channels will designate dummy channels as on a T1 or E1.
If this object is set to diDataEnabled the zero channels
will designate D/I interface channels and data to and
from the device will be transmitted or received on the
D/I port instead of the N/I port.