Abstract: Disclosed is a communication system which improves the system flexibility and serviceability by efficiently controlling presence information. A presence inquiring section makes an inquiry about a presence state of a communicating party. A presence information receiving section receives presence information. A presence information display section displays the received presence information. A presence determining section determines the presence state. A presence information generating section generates the presence information. A presence information sending section sends the presence information upon reception of the inquiry.

Abstract: A route table stores a control step for controlling an automatic call distribution (ACD) process for a termination call. A transfer destination telephone number table stores information with which a transfer destination telephone number is determined. When a control step in the route table is a transfer control step for instructing to transfer a termination call, a call controlling unit refers the transfer destination telephone number table, determines a transfer destination telephone number for the termination call, and transfers the termination call to the transfer destination telephone number using a termination call transfer service of a public telephone network to which public telephone lines are connected.

Abstract: A route table stores a control step for controlling an automatic call distribution (ACD) process for a termination call. A transfer destination telephone number table stores information with which a transfer destination telephone number is determined. When a control step in the route table is a transfer control step for instructing to transfer a termination call, a call controlling unit refers the transfer destination telephone number table, determines a transfer destination telephone number for the termination call, and transfers the termination call to the transfer destination telephone number using a termination call transfer service of a public telephone network to which public telephone lines are connected.

Abstract: A method of registering an IP (Internet Protocol) terminal device including a function to transmit and receive IP packets, to a line-switching exchanger including a database that is used for managing a type and a telephone number of a telephone set is provided. The method includes the steps of connecting the line-switching exchanger and a network-gateway device by use of a radio-base-station-connection line that is used for connecting radio base stations, connecting the network-gateway device and the IP terminal device through an IP network, and registering the IP terminal device as a radiotelephony device in the database. By registering the IP terminal device as a radiotelephony device in the database provided in the line-switching exchanger, the IP terminal device can receive a variety of supplementary services provided by the line-switching exchanger since the IP terminal device is defined as a radiotelephony device, for example, a PHS phone, by the line-switching exchanger.

Abstract: Disclosed is a communication system which improves the system flexibility and serviceability by efficiently controlling presence information. A presence inquiring section makes an inquiry about a presence state of a communicating party. A presence information receiving section receives presence information. A presence information display section displays the received presence information. A presence determining section determines the presence state. A presence information generating section generates the presence information. A presence information sending section sends the presence information upon reception of the inquiry.