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For many years the PABX has used digital switching as a cost effective means of connecting together analogue services and terminals. In fact in the UK, over 50 % of the installed PABXs use digital switching techniques. Across the rest of Europe, the current installed base is not so high, but as essentially only digital PABXs are being installed across the whole of Western Europe, the numbers will soon rise. In the UK, the introduction of cost effective digital transmission systems through BT's Megastream Service and Mercury has meant that the benefits afforded by digital switching have been able to be extended into digitally connected networks. These networks, for a short period of time, used Channel Associated Signalling Systems almost identical to those available on Analogue bearers, but over the next year, most PABX manufacturers in the UK will be offering Common Channel Signalling over these digital bearers. The introduction of the direct digital connection to PABXs and of terminals connected to the PABX using digital transmission means that voice and data services can be fully integrated on the PABX. Thus the PABX can now rightfully be called an Integrated Services Private Branch Exchange or ISPBX. A network of such ISPBX's, with digital transmission and using Common Channel Signalling can justify the name of an Integrated Services Digital Network (ISDN).