SS7 mediation for data network call setup and services interworking

A method of interworking Common Channel Signalling System Number 7 (CCS7) call control messages in a virtual CCS7 data node to terminate calls which were initiated into a data network, comprising the steps of:

• predefining a subset of CCS7 Integrated Services Digital Network (ISDN) User Part (ISUP) messages required for controlling setup and teardown of a data network call;
• translating CCS7 call control messages into a set of primitives used by a network controller and network access server;
• predefining a second set of primitives to exchange with the network access server;
• exchanging said second set of primitives with the network access server to control release of data network side transport resources;
• and
• updating network controller resident data structures to release the call.

A method of interworking Common Channel Signalling System Number 7 (CCS7) call control messages in a virtual CCS7 data node and setting up appropriate resources to initiate incoming calls into a data network, comprising the steps of:

• predefining a subset of CCS7 Integrated Services Digital Network (ISDN) User Part (ISUP) messages required for controlling setup of a data network call;
• translating CCS7 call control messages into a set of primitives used by a network controller checking said set of primitives to authorize call origination;
• predefining a set of primitives to exchange with the network controller;
• exchanging primitives with the network controller for controlling setup of data network side transport resources;
• and
• establishing network control of transport links between a public switched telephone network (PSTN) and said data network.

An architecture for interworking a public switched telephone network and a data network comprising:

• a data network having a network controller and a network access server;
• and
• a means for interworking the public switched telephone network and the data network, said interworking means coupled to the network controller, the data network and a signalling system associated with the public switched telephone network, said interworking means effecting connection from the public switched telephone network to the data network using the signalling system;
• and wherein a first control path exists from the network controller to the network access server for handling enhanced service processing, and a second control path exists from the interworking means to the network access server for handling signalling primitives.