VoIP term refers to transference of Voice over Internet Protocol (IP) of TCP/IP suite of protocol. By using technology of “VoIP” we make traditional calls of telephones from phone or computer to other phone or computer either. We use Internet (that is packet switched network) and public switched telephone network (PSTN) both. All that is required is connection of Internet for VoIP. Technology like this changes all things really because it permits people for receiving phone calls from any place where there is existence of connection of internet. This is just in similar ways as for you could receive emails of yours in any place where you have internet connection.
“Technology of VoIP” term covers wide ranges of technology which includes fax-over-IP services too. This is carried over private IP based network and internet networks both. VoIP are parts of packet voices. This includes frame relay networks and voice-over-asynchronous-transmission-mode (ATM). These run faster than IP but are less prevalent. VoIP has connection across combination of PC, web based telephones and phones. These are connected by means of public lines of telephones for remote gateways of voices. Since, information passes through in discrete packets, therefore there is no need of relying on continuous switched circuit available. By taking use of VoIP we could enhance data and voice services in single network. End user devices (called also client devices) are referred normally as VoIP phones being used in VoIPs. “VoIP Phone” development requires “system on a chip” development. This combines associated logic of glues, (DSP) digital signal processing functions, telephone user interface, and analog interface and (MCU) micro-controller functions.
VoIP working: Steps basically involved in origination of VoIP calls are: Conversion of voice analog signal to formats digitally. Translation and compression of signals to packets of Internet protocol (IP) for internet transmission. Reversal of process at receiving ends. Switching formats digitally back to analog such that telephone calls go across as normal. Calls of VoIP originate on whatever lines of broadband like wireless, coaxial cable, satellite even or Digital Subscriber Line (DSL). Routing calls to VoIP Company. In this place computer converts sounds to packets of data. It is same as packets utilized for transferring internet data like emails. Data is send by packets. This is more efficient far because it enables similar lines. It handles simultaneously more information. Packets of data are sent by means of any multiple network of internet to call’s recipient. Caller receives call. This is done through local carrier of phone, provider wireless or provider broadband. For understanding VoIP it is important for having complete knowledge of differences in between packet switching and circuit switching. Normal telephones use circuit switching for calls over phones. It involves call routing by means of switches at local carriers to person being called. 2 point connection in both directions is called circuit. Differently, packet switching is very efficient in transmission of data. Small data amounts known as packets are sent from 1 system to other. In systems of VoIP, once party in question answers, voice is transmitted by conversion of voice to digitized form. Then segment voice signals to packet stream. 1st step in the process is conversion of voiced analog signals to digital by using analog-digital converter. As because voice digitized needs large bits numbers, compression algorithms are used for reducing volumes of transmitted data. Next, samples of voice have to be inserted to packets of data for carrying on internet. Voice packets protocols are Real time Transport Protocol (RTP) typically. Packets of RTP have header fields specially holding data required for correct re-assemblence of packets to voice signals on other ends. Security and scalability are key issues.