Design and implementation of internetworking system between ATM and PSTN

We design and implement the internetworking system between the ATM network and PSTN, which provides telephone services between the clients of the ATM network and subscribers of the PSTN. The internetworking system consists of the PSTN I/F module, signaling processing module, voice sampling module, voice regeneration module, transmission module, and ATM I/F module. The PSTN I/F module and ATM I/F module are implemented by using the existing commercial hardware products. However, the other 4 modules are implemented for the WIN95 environments by software. The test environment was also implemented and it was found that the internetworking system operates without problems.