VoIP gateway apparatus

A VoIP gateway apparatus which relays a call between a PSTN interface and an IP telephone network interface, the apparatus comprising;

• storage means which stores a correspondence between a PSTN number, which is a telephone number in a PSTN numbering system, and a VoIP number, which is a telephone number in a VoIP numbering system;
• and
• call-receiving control means which, if a call arrives at the VoIP interface, identifies a PSTN number stored in the storage means corresponding to the VoIP number, which is the called party number of the call, converts the identified PSTN number to the called party number of the call, and transmits the call through the PSTN interface.

A VoIP gateway apparatus which relays a call between a PSTN interface and an IP telephone network interface, the apparatus comprising:

• storage means which stores a correspondence between a PSTN number and subaddress, which is a telephone number in a PSTN numbering system, and a VoIP number, which is a telephone number in a VoIP numbering system;
• and
• call-receiving control means which, if a call arrives at the VoIP interface, identifies a PSTN number and subaddress stored in the storage means corresponding to the VoIP number, which is the called party number of the call, converts the identified PSTN number and subaddress to the called party number of the call, and transmits the call through the PSTN interface.

A call relaying method in which a VoIP gateway apparatus relays a call between a PSTN interface and an IP telephone network interface, the method comprising the steps of:

• if a call arrives at the PSTN interface, referring to storage means which stores a correspondence between a PSTN number, which is a telephone number in a PSTN numbering system, and a VoIP number, which is a telephone number in a VoIP numbering system, identifying the VoIP number corresponding to the PSTN number given to the calling party number of the call, converting the calling party number of the call to the identified VoIP number, and transmitting the call through the VoIP network interface;
• and
• if a call arrives at the VoIP network interface, referring to the storage means, identifying the PSTN number corresponding to the VoIP number, which is the called party number of the call, converting the called party number of the call to the identified PSTN number, and transmitting the call through the PSTN network interface.