Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.

Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.

A communication management device includes an incoming call control unit that transmits an extension incoming call instruction to extension telephone terminals when a mobile incoming call instruction transmitted from mobile phone terminals is input, and based on an incoming call response instruction transmitted from the extension telephone terminals, transmits the incoming call response instruction to the mobile phone terminals; an outgoing call control unit that causes the mobile phone terminals to perform call-requesting outgoing call processing for an external telephone terminal based on an extension call request transmitted from the extension telephone terminals, and transmits an extension outgoing call response instruction to the extension telephone terminals when a mobile outgoing call response instruction transmitted from the mobile phone terminals is input; and a communication control unit that performs voice communication control between the external telephone terminal and the extension telephone terminals via the mobile phone terminals.

A communication management device includes an incoming call control unit that transmits an extension incoming call instruction to extension telephone terminals when a mobile incoming call instruction transmitted from mobile phone terminals is input, and based on an incoming call response instruction transmitted from the extension telephone terminals, transmits the incoming call response instruction to the mobile phone terminals; an outgoing call control unit that causes the mobile phone terminals to perform call-requesting outgoing call processing for an external telephone terminal based on an extension call request transmitted from the extension telephone terminals, and transmits an extension outgoing call response instruction to the extension telephone terminals when a mobile outgoing call response instruction transmitted from the mobile phone terminals is input; and a communication control unit that performs voice communication control between the external telephone terminal and the extension telephone terminals via the mobile phone terminals.

An incoming call controlling device (2) includes a connection determining unit (3) configured to determine, when an incoming call to a first phone number is received, whether a mobile phone terminal (6) is connected as an extension phone to the incoming call controlling device (2); an incoming call controlling unit (4) configured to transfer the incoming call to a second phone number when it has been determined that the mobile phone terminal (6) is not connected to the incoming call controlling device (2); and a caller information transmitting unit (5) configured to transmit, to a server (7), identification information and caller information of the incoming call when a transfer by the incoming call controlling unit (4) is performed. The server (7) is configured to notify a phone terminal of the caller information by using a network different from a circuit used for the transfer.

An incoming call controlling device (2) includes a connection determining unit (3) configured to determine, when an incoming call to a first phone number is received, whether a mobile phone terminal (6) is connected as an extension phone to the incoming call controlling device (2); an incoming call controlling unit (4) configured to transfer the incoming call to a second phone number when it has been determined that the mobile phone terminal (6) is not connected to the incoming call controlling device (2); and a caller information transmitting unit (5) configured to transmit, to a server (7), identification information and caller information of the incoming call when a transfer by the incoming call controlling unit (4) is performed. The server (7) is configured to notify a phone terminal of the caller information by using a network different from a circuit used for the transfer.

An object is to provide an incoming-call number notification apparatus capable of notifying a user of the number of incoming calls at the present moment by using simpler equipment. An incoming-call number notification apparatus according to the present invention includes a control unit (14, 15) configured to, when there is an incoming call to a plurality of telephones (20) accommodated in an exchange (10), determine a display color according to the number of incoming calls at the present moment, and instruct the plurality of telephones to blink or light up an incoming-call lamp of its own telephone in the determined display color (20).

An object is to provide an incoming-call number notification apparatus capable of notifying a user of the number of incoming calls at the present moment by using simpler equipment. An incoming-call number notification apparatus according to the present invention includes a control unit (14, 15) configured to, when there is an incoming call to a plurality of telephones (20) accommodated in an exchange (10), determine a display color according to the number of incoming calls at the present moment, and instruct the plurality of telephones to blink or light up an incoming-call lamp of its own telephone in the determined display color (20).

Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.

An object is to provide an incoming-call number notification apparatus capable of notifying a user of the number of incoming calls at the present moment by using simpler equipment. An incoming-call number notification apparatus according to the present invention includes a control unit (14, 15) configured to, when there is an incoming call to a plurality of telephones (20) accommodated in an exchange (10), determine a display color according to the number of incoming calls at the present moment, and instruct the plurality of telephones to blink or light up an incoming-call lamp of its own telephone in the determined display color (20).