Fully nine months after promising to reveal its marketing and technical strategy for Centrex – PABX services on a public switch – British Telecommunications Plc has still to finalise plans as to how or when the product will be marketed. Marketing manager Bonnie Ralph says Bell Atlantic’s two year contract, aimed at helping Telecom commercialise the product, was successful, but could not confirm that GEC Plessey Telecommunications’ software development work for System X (CI No 980) had been completed. It appears that a number of security issues have yet to be fully resolved. Despite this, Telecom insists there will be a market at many levels for Centrex when it is eventually launched, and has hopes for Centrex on System X local exchanges from 1991; Telecom does say that unspecified interim products may start appearing at an earlier date.