Just like any gift of technology, VoIP still has a lot to look forward to as we encounter various problems with it everyday. Apparently this stems from the fact that endless possibilities as far as management of networks will always have a loophole that needs to be addressed.
But these are only normal. Technology has a lot of loose ends and the only way to answer them is through studying and perhaps soliciting advice from forums where people search for answers themselves. Not a bad way to learn considering we can learn from other specialists spread all over the world today.