| 摘要 |
The connection device allows at least one auxiliary acoustic, optical and/or mechanical signal source (50) to be connected to a digital telephone handset (10), which is connected to a digital telephone network. An evaluation device (30) within the handset evaluates control data supplied via a control channel or the communications channel, for controlling a switching device (40) which opens and closes a signalling circuit (60) coupled to the auxiliary signal source. |
