Apparatus and method for interworking switching system network

An interworking method in a switching system network, having first and second network sides, comprising:

• registering a routing address for a first network side at an interworking switch for interworking with a network operating with different protocol;
• registering the registered routing address as a network address at a first network side interface;
• determining whether a called party address of a call process message received from a second network side has previously been registered as an address matching the second network side;
• and
• if the called party address of the received call process message is registered as the address matching the second network side, converting the received call process message into a converted call process message using a first network interworking function, and transmitting the converted call process message to the first network.

An interworking method in a switching system network, comprising:

• registering an address as a first registered address to a routing scenario for a B-ISUP (B-ISDN User Part) network at an interworking switch between a PNNI (Private Network to Network Interface) network and the B-ISUP network;
• registering the first registered address as an exterior address of a PNNI interface at a B-ISUP interface;
• checking whether a called party address of a call process message received from the PNNI network has previously been registered as the exterior address matching the PNNI network side;
• and
• if the called party address of the received call process message has previously been registered as the exterior address matching the PNNI network side, converting the received call process message into a call process message used in the B-ISUP network, using a B-ISUP interworking function (IWF), and transmitting the call process message used in the B-ISUP network to the B-ISUP network.

An interworking method in a switching system network, comprising:

• registering an address to a routing scenario for a B-ISUP (B-ISDN User Part) network at an interworking switch as a first registered address for interworking in a PNNI (Private Network to Network Interface) network and the B-ISUP network;
• registering the first registered address as an exterior address of a PNNI interface at a B-ISUP interface;
• checking whether a called party address of a call process message received from the B-ISUP network is a local switch address or previously registered in the B-ISUP routing scenarios;
• and
• if the called party address of the received call process message is not the local switch address and has not been previously registered in the B-ISUP routing scenarios, converting the received call process message into a call process message for the PNNI network using a PNNI interworking function (IWF), and transmitting the converted call process message to the PNNI network.