Performance Evaluation of Packet Loss Replacement using Repetititon Technique in VoIP Streams

. Voice over Internet Protocol is an upcoming technology. VoIP enables voice communication through the Internet. Internet provides lot of services to the people. VoIP differs from conventional networks. The online transmission of audio data over networks faces lot of problems. Real time voice transmission is not as easy as ordinary text data. Networks are not designed to support real time communications. The conversational quality of a VoIP communication is dependent on several factors such as networking conditions, coding process used, speech content, type of error correction, flow id. The factors which affects the Quality of Service (QoS) is due to delay, delay variation, packet loss, repeat request, loss rate, QoS control, throughput, network security, network reliability, providing bandwidth, voice compression, echo suppression and jitter on the perceived conversational quality. Packet loss is a serious and critical issue for voice over internet protocol applications. It degrades the performance of VoIP. This paper provides Packet loss replacement mechanisms and discusses their suitability for use in IP-based networks by using a receiver based repetition technique. The comparison of static play out buffer with optimal play out buffer was carried out in this paper. It performs better quality monitoring of VoIP service at the receiver side. This work is implemented in ns-2. The performance results suggest that the overall quality of VoIP is better.