Internetwork communication system for managing subscriber switches between networks

A communication system comprising:

• a first and second network, each having a plurality of subscriber terminals accommodated therein and having respectively different number plans;
• each of the plurality of subscriber terminals accommodated in the first network, which issues a call to another network through the second network, the subscriber terminals including
• registration means for notifying the second network of an identifier of the first network and a subscriber number of the subscriber terminal in the first network to register the identifier and the subscriber number over the second network;
• the second network including
• inter-network registration notification means for notifying the first network of the registration and the subscriber number in the first network in response to the registration by the registration means;
• wherein the first network further includes
• recognition means, when receiving a notification from the inter-network registration notification means, for recognizing receipt of the notification, and
• recognition result notification means for notifying the second network a recognition result of the recognition means;
• the second network including
• subscriber number allocation means for allocating a subscriber number in the second network to the subscriber terminal in response to the recognition result notification from the recognition result notification means,
• allocated number correlative table memory means for preparing and storing therein an allocated number correlative table showing a correlation between the subscriber number in the second network with the identifier of the first network and the subscriber number in the first network, and
• allocated number notification means for notifying the first network of the subscriber number in the second network and an identifier of the second network;
• the first network including
• subscriber number correlative table memory means for preparing and storing therein a subscriber number correlative table showing a correlation between the subscriber number in the first network, the subscriber number in the second network and the identifier of take second network in response to the notification from the allocated number notification means;
• and
• wherein, when the subscriber terminal located in the second network issues a call, the second network transfers a call control to the first network according to the allocated number correlative table, while the first network performs the call control according to the subscriber number correlative table.

A communication system comprising:

• a first and second network, each having a plurality of subscriber terminals accommodated therein and having respectively different number plans,
• each of the plurality of subscriber terminals, accommodated in the first network, which issues a call to another network through the second network, the subscriber terminals including
• registration means for notifying the second network of an identifier of the first network and a subscriber number of the subscriber terminal in the first network to register the identifier and the subscriber number over the second network;
• the second network including
• subscriber number allocation means for allocating a subscriber number in the second network to the subscriber terminal in response to the registration by the registration means,
• allocated number correlative table memory means for preparing and storing therein an allocated number correlative table showing a correlation between the subscriber number in the second network with the identifier of the first network and the subscriber number in the first network, and
• allocated number notification means for notifying the first network of the subscriber number in the second network and an identifier of the second network;
• the first network including
• subscriber number correlative table memory means for preparing and storing therein a subscriber number correlative table showing a correlation between the subscriber number in the first network, the subscriber number in the second network and the identifier of the second network in response to the notification from the allocated number notification means;
• wherein the secured network, when the subscriber terminal issues a call, discriminates the first network of the subscriber terminal and transfers to the discriminated first network dial data entered by the subscriber terminal together with the identifier of the second network and the subscriber number in the second network, by referring to the allocated number correlative table;
• and
• wherein the first network confirms whether the transferred subscriber number in the second network is the subscriber number allocated to the subscriber terminal by referring to the subscriber number correlative table, analyzes the transferred dial data and issues a call to a party corresponding to the dial data according to an analysis result.

A communication system comprising:

• a first and second network, each having a plurality of subscriber terminals accommodated therein and having respectively different number plans;
• each of the plurality of subscriber terminals, accommodated in the first network, which issue a call to another network through the second network, the subscriber terminals including
• registration means for notifying the second network of an identifier of the first network and a subscriber number of the subscriber terminal in the first network to register the identifier and the subscriber number over the second network;
• the second network including
• inter-network registration notification means for notifying the first network of the registration and the subscriber number in the first network in response to the registration by the registration means;
• the first network including
• recognition means, when receiving notification from the inter-network registration notification means, for recognition the notification, and
• recognition result notification means for notifying the second network of a recognition result of the recognition means;
• the second network including
• subscriber number allocation means for allocating a subscriber number in the second network to the subscriber terminal in response to the recognition result notification from the recognition result notification means,
• allocated number correlative table memory means for preparing and storing therein an allocated number correlative table showing a correlation between the subscriber number in the second network with the identifier of the first network and the subscriber number in the first network, and
• allocated number notification means for notifying the first network of the subscriber number in the second network and an identifier of the second network;
• the first network including
• subscriber number correlative table memory means for preparing and storing therein a subscriber number correlative table showing a correlation between subscriber number in the first network, the subscriber number in the second network and the identifier of the second network in response to the notification from the allocated number notification means;
• wherein the second network, when the subscriber terminal issues a call, discriminates the first network of the subscriber terminal and transfers to the discriminated first network dial data entered by the subscriber terminal together with the identifier of the second network and the subscriber number in the second network by referring to the allocated number correlative table;
• and
• wherein the first network confirms whether the transferred subscriber number in the second network is the subscriber number allocated to the subscriber terminal by referring to the subscriber number correlative table, analyzes the transferred dial data and issues a call to a party corresponding to the dial data according to an analysis result.

A communication system, comprising:

• a plurality of networks including an originating network and a destination network, said originating and destination network having different number plans for communicating with respective subscriber terminals, each said subscriber terminal operable to generate and transmit a movement registration signal identifying an identifier of the originating network and an originating network subscriber terminal number to the destination network, in response to movement of said originating network subscriber terminal from an originating network coverage area to a destination network coverage area upon issuance of a call;
• notification means at said destination network responsive to the movement registration signal for notifying the originating network that the originating network subscriber terminal is located within the destination network coverage area;
• recognition means at said originating network responsive to the notification by the notification means for recognizing and approving the movement registration of the originating network subscriber terminal to the destination network;
• allocation means at the destination network responsive to the registration approval by the originating network for allocating and transmitting a destination network subscriber number to the originating network;
• and
• correlation means at the originating network responsive to the allocation means for storing and correlating the originating network subscriber number with an identifier of the destination network to control the issued call.

A method of establishing a communication link between subscriber terminals of a plurality of networks having different number plans, the method comprising the steps of:

• generating and transmitting a first signal identifying an identifier of an originating network and an originating network subscriber terminal number in response to movement of an originating network subscriber terminal from an originating network coverage area to a destination network coverage area;
• generating and transmitting a second signal notifying the originating network that the originating network subscriber terminal is located within the destination network coverage area;
• receiving at the originating network the second signal;
• generating and transmitting to the destination network a third signal approving the movement registration of the originating network subscriber terminal to the destination network;
• allocating a destination network subscriber number to the originating network subscriber terminal;
• storing and correlating the allocated destination network subscriber number with the originating network identifier and the originating network subscriber number;
• generation and transmitting a fourth signal to the originating network notifying the originating network of an identifier of the destination network and the allocated destination network subscriber number;
• storing and correlating the originating network subscriber number with the destination network identifier and the allocated destination network subscriber number in a correlative table memory;
• determining the location of the originating network subscriber terminal in response to an issuance of a call to another one of the plurality of networks in accordance with the correlative table memory;
• transferring corresponding data of the correlative table memory to the originating network in response to a determination that the originating network subscriber terminal issuing a call is located within the coverage area of the destination network;
• verifying that the transferred data matches the data stored in a movement destination table memory of the originating network;
• arid
• issuing a call by the originating network to said one of the plurality of networks in response to a verification of a data match.