On-premise PBX (TDM) and on-premise PBX (IP) incorporate the traditional fixed telephone system installed on site. The IP-based telephone systems segment begins with Hosted PBX. A distinct feature of hosted PBX is that the telephone system is operated on a server and as software but is the property of the end user, who is also responsible for maintenance (single instance).
As regard, the development of the European market for telephone systems, a clear shift can be observed from traditional on-premise telephone systems to hosted/cloud telephone systems.
Using hosted/cloud telephone systems as opposed to classic telephone systems brings significant advantages that correspond to the general change in the demands of working life.
This trend is accelerating, as the telephone companies will change from ISDN to All-IP in the foreseeable future. Therefore, standard telephone systems will no longer be usable.