Improvements in or relating to telecommunication systems

摘要

The inter-connection of dissimilar telecommunications networks, such as a Private Branch eXchange (PBX) and an Asynchronous Transfer Mode (ATM) network, is often a requirement. PBXs have highly complex call control facilities, whereas ATM switches have simple call control facilities. By re-using the call control software of a PBX to control the configuration of the ATM switch, call control facilities for the ATM switch can be effected, without the complexity and expense of developing this software for the ATM switch. This is achieved by use of a call inter working function to convert the call signalling commands and data from the form generated by the PBX into the form required by the ATM switch.