Voice access technology on digital data network

A method is presented to transmit voice and fax on Digital Data Network (DDN) leased lines which guarantees high quality and real time service in a narrowband network. The method is described with algorithms for its implementation. The method provides a simple, reliable algorithm for synchronized catching with improved catching time, holding time and other key features. Practical tests show that this method not only provides stable, high quality performance which is suitable for integrated service in compainies, but can also be easily implemented in other VoIP (voice over IP) applications.