Benny, thanks for chipping in.

The voicemail indicator is part of an optional subsystem so there is a fair amount of work involved to get this, though other nice things are available too if this is done. Whilst not quite the amount of work of MMS this is still quite a fair amount of work. The functionality is also operator dependant. As the question posted by OP was how to get notification, the use of SMS text message seems to answer the thread.

If we are going to raise a formal request for functionality would it not make sense to look at the areas of DCS that we would like to get it all in one?