Relay device and relay method of voice signal

A relay device that includes a telephone relay unit and a wireless communication relay unit,

• wherein the telephone relay unit receives call information from a telephone via a network, and after a communication partner designated by the call information has responded, transmits/receives a voice signal to/from the telephone,
• the wireless communication relay unit, to which a repeater that is a relaying radio is connected, transmits/receives a voice signal to/from a radio via the repeater, moreover
• the telephone relay unit determines at least one destination apparatus that is a radio to be called based on the call information received from the telephone, and transfers a voice signal received from the telephone to the wireless communication relay unit,
• the wireless communication relay unit transfers a voice signal transferred from the telephone relay unit to the destination apparatus that is the communication partner, and
• the telephone relay unit includes a call destination table in which a record including the call information, an address of the destination apparatus, and an apparatus type of the destination apparatus is stored for each of the radios, and a transfer control table in which a record including the apparatus type and the transfer control mode of a voice signal is stored for each of the apparatus types, and
• the telephone relay unit determines the apparatus type of the destination apparatus by referring to the call destination table, determines the transfer control mode of a voice signal corresponding to the determined apparatus type by referring to the transfer control table, and transfers the voice signal to the wireless communication relay unit using the determined transfer control mode, and
• the transfer control mode of a voice signal is one of a constant transmission mode in which voice signals are transferred without interruption in a period in which the telephone and the destination apparatus perform communication, a VOX mode in which only when a voice signal whose level is a predetermined level or more is input from a telephone, the voice signal is transferred, and a DTMF mode in which voice signals are transferred without interruption in a period after a tone signal instructing a transmission start was input until a tone signal instructing a transmission stop is input.