Kartik Powerpoit

Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. Some VoIP services may only allow you to call other people using the same service, but others may allow you to call anyone who has a telephone number - including local, long distance, mobile, and international numbers. Also, while some VoIP services only work over your computer or a special VoIP phone, other services allow you to use a traditional phone connected to a VoIP adapter. ,[object Object]
How VoIP / Internet Voice Works,[object Object],VoIP services convert your voice into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is converted to a regular telephone signal before it reaches the destination.,[object Object]
If I have VoIP service, who can I call?Depending upon your service, you might be limited only to other subscribers to the service, or you may be able to call anyone who has a telephone number - including local, long distance, mobile, and international numbers. If you are calling someone who has a regular analog phone, that person does not need any special equipment to talk to you. Some VoIP services may allow you to speak with more than one person at a time. ,[object Object]
VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs which encode speech allowing transmission over an IP network as digital audio via an audio stream. Codec use is varied between different implementations of VoIP (and often a range of codecs are used); some implementations rely on narrowband and compressed speech, while others support high fidelitystereocodecs.,[object Object]
 History,[object Object],[object Object]
1981 — IPv4 is described in RFC 791.
1985 — The National Science Foundation commissions the creation of NSFNET.
1995 — VocalTec releases the first commercial Internet phone software.
1996 —
ITU-T begins development of standards for the transmission and signaling of voice communications over Internet Protocol networks with the H.323 standard.
US telecommunication companies petition the US Congress to ban Internet phone technology.
1997 — Level 3 began development of its first softswitch, a term they coined in 1998.
1999 —
The Session Initiation Protocol (SIP) specification RFC 2543 is released
Mark Spencer of Digium develops the first open sourcePrivate branch exchange (PBX) software (Asterisk).
2004 — Commercial VoIP service providers proliferate]
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