Abstract
This chapter briefly discusses the major technology that supports WLAN voice, Voice over IP (VoIP). It introduces the overall concept of a layered model and the Open Systems Interconnection (OSI) reference model and then examines in detail how those concepts apply to the TCP/IP protocol suite. In particular, the study describes the functions of the Real-time Transport Protocol (RTP), the IP protocol for voice transport, and how Multi-Protocol Label Switching (MPLS) can be used to provide Quality of Service (QoS) for voice applications. Protocols are the basic building blocks of a communications network. A protocol is a set of rules describing how some part of the information exchange should be conducted. In order for two devices to interoperate and exchange data successfully, they must employ compatible protocols. Along with this, the study explains that the first major step toward computer system compatibility was the development of the OSI Reference Model in the early 1980s. Developed by the International Organization for Standardization (ISO), the OSI Reference Model was the first step toward organizing the problem of end-to-end network compatibility.
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