Wang software specialist Tudor Computing Ltd, Esher, Surrey has entered the voice-messaging market with the launch of an ISDN compatible product which it claims is an industry first. When Tara Hotel asked Tudor to develop a wake-up call system three years ago, the modest development burgeoned into a more ambitious project along the lines of voice messaging systems that were selling well in the US. The installed base of these corporate voice boxes is currently 12,000 compared to 100 units in use in the UK with each system catering for between 100 and 2,000 users. Called Tudorvox, Tudor’s offering claims to be the only system based on ISDN architecture and while it currently runs over analogue lines, managing director Erryl Tudor says that the system is upgradable to the ISDN digital standard for voice and data. Tudorvox is built around Intel Multibus II technology.