VoIP (Voice over Internet Protocol)

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Abstract— this document gives information on the VoIP (Voice over Internet Protocol) and the use of VoIP use in the world. The document aims to give explicit knowledge on the VoIP, its protocols and its working implementation and different methods are also enshrouded light upon.

Introduction

VoIP stands for Voice over Internet Protocol or IP Telephony, a category of hardware and software that enables people to use the Internet as the transmission medium for telephone calls by sending voice data in packets using IP rather transmission of telephone circuits.Voice over Internet Protocol , also called VoIP, is a group of resources that enable the voice signal to travel through the Internet using a Internet Protocol (IP). This means that it sends the voice signal into digital form, into data packets, instead of sending in analog circuits through usable only by conventional telephone network which is called as Public Switched Telephone Network or PSTN.

The protocols that are used to send voice signals over the IP network protocols known as Voice over Internet Protocol. These can be viewed as commercial applications of the "Experimental Network Voice Protocol" (1973), invented by ARPANET [1].

The VoIP traffic can travel on any IP network, including those connected to the Internet, such as LAN or local area networks.

It is very important to differentiate between Voice over IP and IP Telephony.

IP Telephony is the publicly available telephone service therefore numbered E.164 , made with VoIP technology.

VoIP is a set of standards, devices, protocols, ultimately the technology that allows voice communication over IP protocol.

Under Voice over IP (VoIP) it is meant simply to make calls over computer networks using the Internet Protocol (IP). Depending on how and where the phone is held here, it is called IP Telephony, Internet telephony and Internet telephony, sometimes by DSL telephony. The technique is always the same and is referred to as Voice over IP.

IP telephony is just another term that describes all a bit technology-neutral IP-based. Internet telephony is a special form of IP telephony. Here, the current PBX is replaced in a separate cable network and the phones integrated into the data network of a company. Thus run the data and voice over a network. This requires IP-enabled phones (even more expensive), a suitable language for data network, today to 95% based on Ethernet and a telephony server for teaching and performance. In Internet telephony calls are routed via a wide area network, namely, the world's largest WAN, the Internet. Since VoIP for mass market only really makes sense if you have a DSL line at home own calls, the marketing of providers often speaks of Internet telephony. DSL is the only shuttle to the internet, that is why this marketing concept to take quite seriously [2].

VoIP Protocols

The objective of the protocol VoIP packet is divided into audio streams for transport over IP-based networks. The IP networking protocols were not originally designed for the fluid real-time audio or any other type of communication medium. The PSTN is designed for transmission of voice, however ...