A new approach to the implementation of VoIP for SOHO network

摘要

VoIP has emerged from the advancements and revolutions in packet-based networks and has seen tremendous improvements over the years. Normally there are two approaches to the implementation of VoIP, one in the form of soft phone and other in the form of dedicated IP phone. In this paper we describe a new scheme to the implementation of VoIP which is different from both of these two approaches in that rather than implementing all the layers of Internet as in dedicated IP phones or developing a software application to handle voice communication as in soft phone, We have relied on the functionalities of ordinary analog telephones (i.e. to generate voice and signaling information) and computer application (i.e. to transfer packet based data to the destination) in implementing VoIP. In our proposed scheme, actual voice data and signaling data (DTMF tones) will be transferred to the computer through our proposed hardware and the computer application written in JAVA takes the responsibility of transferring this voice data to the destination in the form of IP packets. We have used SIP as our signaling protocol to handle call setup and tear down. The prototype of our proposed scheme has been successfully completed and tested on our university LAN setup and I t is giving acceptable voice quality, un noticeable delays and latency, which are important metrics to consider while implementing VoIP.