Communication system, call connection server, terminal apparatus and communication method

A call connection server which is part of a communication system that includes a private base station apparatus configured to connect with an IP network by transmitting and receiving IP packets, a mobile terminal device configured to connect with said IP network by wireless communication through either a public wireless base station or said private base station apparatus, and an IP telephone terminal configured to talk through said private base station apparatus with said IP network by transmitting and receiving IP packets, said call connection server comprising:

• a storing unit configured to store said designation address of said IP telephone terminal and said terminal identifier in association with said predetermined telephone number of said mobile terminal device;
• a registration information receiving unit configured to receive, when said mobile terminal device is connected with an IP network which can be used for communication with said call connection server, from said mobile terminal device a terminal identifier for identifying said mobile terminal device and a terminal location address for identifying the location of the current private base station apparatus on said IP network with which said mobile terminal device is connected;
• an authentication unit configured to authenticate said mobile terminal device on the basis of said terminal identifier which is received and said terminal identifier which is stored in said storing unit;
• a priority designation address setting unit configured to associate, when said mobile terminal device is authenticated by said authentication unit, said terminal location address as received and said predetermined telephone number, which is stored in said storing unit in association with said terminal identifier, and set said terminal location address as a priority designation address which is given a priority higher than said designation address;
• and
• a call connection unit configured to connect said call to said mobile terminal device on the basis of said terminal location address in the case where said priority designation address has been set up.

A mobile terminal device which is part of a communication system that includes a private base station apparatus configured to connect with an IP network by transmitting and receiving IP packets, an IP telephone terminal configured to talk through said private base station apparatus with said IP network by transmitting and receiving IP packets, and a call connection server configured to connect a call at a predetermined telephone number of said IP telephone terminal to either said IP telephone terminal or said mobile terminal device on the basis of a designation address of said IP telephone terminal which is associated with said predetermined telephone number, wherein

• said mobile terminal device is provided with a registration information transmitting unit configured to transmit, when it is connected with said IP network, a terminal identifier and a terminal location address to said call connection server, said terminal location address is for identifying the location of the current private base station apparatus on said IP network which can be used for communication with said call connection server from said mobile terminal device, and associates said terminal location address as received and said predetermined telephone number, and sets said terminal location address as a priority designation address which is given a priority higher than said designation address, and
• wherein said mobile terminal device is configured to connect with said IP network by wireless communication through either a public wireless base station or said private base station apparatus.

A communication method for a communication system that includes a private base station apparatus configured to connect with an IP network by transmitting and receiving IP packets, a mobile terminal device configured to connect with said IP network by wireless communication through either a public wireless base station or said private base station apparatus, an IP telephone terminal configured to talk through said private base station apparatus with said IP network by transmitting and receiving IP packets;

• and a call connection server configured to connect a call at a predetermined telephone number of said IP telephone terminal to either said IP telephone terminal or said mobile terminal device on the basis of a designation address of said IP telephone terminal which is associated with said predetermined telephone number, wherein said call connection server is configured to store said designation address and said terminal identifier in association with said predetermined telephone number, said communication method comprising:
• a step (A) in which, when said mobile terminal device is connected with a IP network which can be used for communication with said call connection server, said call connection server receives from said mobile terminal device a terminal identifier for identifying said mobile terminal device and a terminal location address for identifying the location of the current private base station apparatus on said IP network with which said mobile terminal device is connected;
• a step (B) in which said call connection server authenticates said mobile terminal device on the basis of said terminal identifier and said terminal identifier as stored;
• a step (C) in which, when said mobile terminal device is authenticated in said step (B), said call connection server associates said terminal location address as received and said predetermined telephone number, which is stored in association with said terminal identifier, and sets said terminal location address as a priority designation address which is given a priority higher than said designation address;
• and
• a step (D) in which, in the case where said priority designation address has been set up, said call connection server connects said call to said mobile terminal device on the basis of said terminal location address.