A Survey of Packet Loss in VoIP

This paper surveys packet loss in Voice over Internet Protocol (VOIP). The voice quality is affected by many network impairments. IP networks are on a steep slope of innovation that will make them the long term carrier of all types of traffic, including voice. Such networks are not designed to support real time voice communication because of their variable characteristics. 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, flowid. The factors which affects the quality of service 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 survey gives an overview of existing Packet loss concealment mechanisms and discusses their suitability for use in IP-based networks. Additionally, the impacts of IP over wireless networks on the requirements of error control mechanisms are discussed. Different network scenarios are used to assess the performance of retransmission-based error correction and forward error correction.