In last 40 years, significant research have happened on how to preserve and enhance fundamental quality of voice when it traverses in “packet” form over networks. The author presents here his earlier work carried out in the context of VoATM, VoFR, VoIP. With current interest in VoLTE (Voice over LTE) and Voice-based Intelligent Systems, work on essence of voice quality in packet communication has emerged very meaningful. The article covers how Quality-of-Service could be enhanced by combating latency, jitter, noise, echo, packet error, packet loss, activity discontinuity as well as codec tandemming.  Follow twitter (@AloknathDe) or linkdin article: