| 摘要 |
An improved inter-communication system is disclosed wherein master stations are selectively interconnected to a plurality of shared amplifiers and are characterized by such features as: means for selectively securing and reserving an amplifier automatically in the course of making a call; locator-status indicator means adapted to indicate automatically the status condition of any one of several selected master stations (e.g. out of office) when a set is interrogated; automatic privacy means adapted to allow a called person to decide whether to respond by voice or by an alternate reply signal, and to prevent eavesdropping; a simplified, rapid means for setting up a conference; a recorder selectively connectable for one-way or two-way recording; automatic call-cancellation; single-carrier carriage of encoded status, or other signals, and the like.
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