For all the discussion about video conferencing and other multimedia applications,the core business media remain voice, data and fax. Yet Computer TelephonyIntegration (CTI), the merger of voice and data on the network, is havingrelatively little impact on the mass market (see “CTI Rides Again,“November 1, page 39). History repeats itself in our business. The originalIBM PC was open enough to provide for multivendor competition. The adoptionof 10BASE-T allowed the LAN market to grow. Now the question for CTI iswhat will open up the telephony infrastructure to an equivalent scale ofmultivendor competition?