An IP PBX is more cost effective and comes with more advanced features. It is flexible and scalable as per your requirement. In case of IP PBX phone systems, they come with easy to use web-based configuration interface which is easy to manage or configure phone systems remotely. While with EPABX comes with limited features and expensive. Incase of EPABX,any sort of technical issue rises, the person will have to go at that place physically in order to resolve it.