Abstract: A feature apparatus is arranged to share exclusive access, to a time division multiplex switching network, with another element of a telephone switching facility (PBX). The other element may be a line appearance group, or a service circuit. The feature apparatus is arranged within an equipment enclosure common to the switching facility, along with a power supply for supplying energizing current for operation of the switching facility and the feature apparatus so that the PBX may support a voice message feature for example, usually without an additional floor space requirement typical of other systems arrangements.