IP PBX or IP Centrex? This white paper may help you decide

I recommend that you obtain a copy of Global Knowledge's free white paper Selecting VoIP For Your Enterprise.

Written for and provided to Global Knowledge by Internet Telephony magazine, the report has a helpful section on whether to deploy your enterprise VoIP solution in-house through IP PBX, or to use a hosted service provider solution such as IP Centrex.

This paper gives a balanced treatment to this decision, as well to potential pitfalls and how to overcome them. I recommend you download this concise but authoritative read.