British Telecommunications Plc has enhanced the software on all variants of the GEC Plessey Telecommunications Ltd iSDX range of PABXs. The release 3.7 upgrade includes software support and an interface for external voice processing devices, including enhanced automatic call distribution. Other improvements include better key system emulation, integrated voice messaging, packet switching, operator call retrieval and MF4 signalling. It is available now for the iSDX 300 and 3000, and costs vary according to the application.
