An overview of the issues associated with carrying out Voice over internet protocol (VOIP) with quality of service (QOS) is been explained in this paper. An Internet Protocol (IP) telephone system uses packet-switched Internet telephony, to transmit telephone calls over the Internet as opposed to the circuit-switched telephony used by the traditional Public Switched Telephone Network (PSTN). The audio message goes from one point to another in countless individual network packets across the Internet. This type of communication presents special TCP/IP challenges because the Internet wasn't really designed for this kind of real-time communication. These challenges and ways of reducing packet loss is described.
Internet telephony  technology has been in existence for many years in one form or another, but only fairly recently has it became reliable and trusted enough to be a serious choice for business. While Internet telephony was once an eccentricity often plagued for garbled and dropped calls, these days a well-planned and implemented VoIP system can provide call quality and reliability that rivals traditional PSTN. It ensures the network infrastructure is optimized by providing an incredible reach for end-to-end customers and service offerings.
New Networking technologies, Services and Applications are all arriving on the market, each with an aim to deliver a QoS that is equal to or better than the legacy equipment . While criteria for measuring QoS in packet networks are more concerned on minimizing error rates, voice channel is measured based on the perceived quality of speech. Because users of Public Switched-Telephone Networks have become so use to good speech quality, it is imperative VOIP technology do not degrade the quality of service. Therefore in the implementation of VOIP network, ensuring QoS while forwarding packets cannot be over-emphasized . VoIP can guarantee high-quality voice transmission only if the...