Voice communications apparatus is connected to a general subscriber telephone set or a broadband telephone set, to communicate over the public switched telephone network. The device may include two coupling halves, which may be articulated relative to one another. The flange member may be received on the sleeve such that the flange member is movable in a radial direction relative to the sleeve. The BACS may further include a directional current element in signal communication with both the first current source, the second current source, the output of the BACS, the amplifier input, and the capacitor, where the directional current element is configured to prevent current flow from the output BACS to the first current source.