Architecture and protocols for IN/Internet interworking

Following an introduction to the technical background, and service classes, the paper proposes an enhanced distributed functional plane (DFP) architecture to support IN/Internet interworking. The architecture features a three-layer interworking: network layer, service layer and management layer. It enlarges the service scope of PINT (PSTN/Internet interworking), covering also Internet telephony. Signalling information flow for an example service is presented to demonstrate the feasibility of the proposed architecture. Finally a discussion is devoted to VoIP techniques, including the appropriate protocol stack, call control mechanism, speech compression algorithm, and DTMF signal detection