Patent ID: 9532189
Filing Date: 2016-12-27
CPC Classification: H04B,H04W

Claim Text:
1. A master station which is provided in an intercom system and is wirelessly connected to a plurality of substations, the master station being connected to an internal radio configured to wirelessly communicate with an external radio provided for a wireless system different from the intercom system, the master station comprising: a receiver configured to receive a signal transmitted from any one of the plurality of substations; a transmitter configured to transmit an audio signal to one of the plurality of substations; a mode setting unit configured to set the master station in either a normal mode or an external wireless transmission mode, the normal mode being the mode in which a caller, which is one of the plurality of substations, communicates with the substations in a group in which the caller is included, the external wireless transmission mode being the mode in which a caller, which is one of the plurality of substations, communicates with the external radio via the master station and the internal radio; an audio signal output unit configured, when the master station is set to the external wireless transmission mode and a caller communicates with the external radio via the master station and the internal radio, to output to the internal radio, a first audio signal which is transmitted from the caller and received by the receiver; a storage unit configured to store group setting information of the plurality of substations and destination group setting information, the group setting information indicating which substations are included in each group of a plurality of groups, the destination group setting information indicating to which group in the plurality of groups the first audio signal is to be transmitted; and a controller configured to cause the transmitter, with reference to the group setting information and the destination group setting information, to transmit the first audio signal to the substations of the group indicated by the destination group setting information.