I am in the process of determining if VOIP is more accessible and flexible compared to an existing, traditional PBX system. I cannot find whether VOIP provides the call center functions like a PBX system (i.e. call duration reports, number & times for an extension report, etc.) Also, I did not find any information in regards to calling pools, fall overs on extensions, etc. and if that is handled at the extension (phone) or in the call switching module. Any help or direction to more specific details would be appreciated.