To Host or not to Host, that is the question.
There is great discussion and conflict in opinion on using a hosted VoIP, or on premise VoIP solution.
Hosted offers the advantage of not maintaining on premise PBX equipment. Since there are many on-site PBX's to choose from, it is difficult to say for certain which solution would be more advantages’. Some on site IP PBX’s offer quick investment turnaround.
At the end of the day, it is important to have a VoIP expert to consult with, and examine the pros and cons of all the options in order to make the best decision.