In nurse call systems that enable communication from a plurality of cordless handsets with a plurality of extension terminals carried by nurses belonging to a group, a nurse call conversion unit is provided between a nurse call control device and a private branch exchange. A call signal for a group representative call in which only an identification number for a group is given is transmitted by the nurse call conversion unit from the nurse call control device to the private branch exchange. From this call signal, the private branch exchange generates a call signal for extension terminals belonging to a group and calls the extension terminals.

In nurse call systems that enable communication from a plurality of cordless handsets with a plurality of extension terminals carried by nurses belonging to a group, a nurse call conversion unit is provided between a nurse call control device and a private branch exchange. A call signal for a group representative call in which only an identification number for a group is given is transmitted by the nurse call conversion unit from the nurse call control device to the private branch exchange. From this call signal, the private branch exchange generates a call signal for extension terminals belonging to a group and calls the extension terminals.

In nurse call systems that enable communication from a plurality of cordless handsets with a plurality of extension terminals carried by nurses belonging to a group, a nurse call conversion unit is provided between a nurse call control device and a private branch exchange. A call signal for a group representative call in which only an identification number for a group is given is transmitted by the nurse call conversion unit from the nurse call control device to the private branch exchange. From this call signal, the private branch exchange generates a call signal for extension terminals belonging to a group and calls the extension terminals.

On startup, a mobile station application will determine the current carrier network and submit a query to an application server that will return the correct location server configuration for the specified network. This information will be used on the mobile station to dynamically configure the device through the available GPS chipset API.

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.