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Vonage is a broadband company that markets a telephone service using Voice Over Internet Protocol (VOIP) technology. VOIP has become a low-cost alternative to costly land line phone service. In simple terms, VOIP uses your broadband connection (DSL or cable) as a telephone line to the external world. Your call traverses the Internet... more »
Comcast is a company that offers high speed Internet service that comes with one primary e-mail address and six more secondary e-mail addresses. This can be convenient for those who have children or who want to give one of the e-mail addresses to a friend or relative who needs one. more »
Before looking at a digital phone network, it is worth briefly examining an analog network. Analog phones utilize the traditional RJ-45 telephone wiring present in houses and older business buildings. Analog systems convert voice and data noise to electrical impulses and transmit them across wires to a switch. This internal switch... more »
Telephone service technology continues to evolve. It has gone all the way from the beginning of telephone service, which required an operator to place calls, to "party" or shared lines, to cordless telephones, to mobile telephones, many of which have multiple functions besides placing and receiving calls. Digital telephone service is... more »
Buying a used digital phone can save you big bucks over buying new, but there are a few things you need to keep in mind before making the purchase. Here's how to buy that digital phone and not be disappointed. more »
Digital phone services can be a major convenience. They make it easier to manage your phone service while you are away from home and allow you to... more »
Digital telephones convert your voice into a digital signal that travels over the Internet or a private network before being converted back into a... more »
Voice over Internet Protocol (VoIP) is a general term for a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks. Other terms frequently encountered and synonymous with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone.
Internet telephony refers to communications services — voice, facsimile, and/or voice-messaging applications — that are transported via the Internet, rather than the public switched telephone network (PSTN). The basic steps involved in originating an Internet telephone call are conversion of the analog voice signal to digital format and compression/translation of the signal into Internet protocol (IP) packets for transmission over the Internet; the process is reversed at the receiving end.
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 fidelity stereo codecs.
History
* 1974 — The Institute of Electrical and Electronic Engineers (IEEE) published a paper titled "A Protocol for Packet Network Interconnection."Vinton G. Cerf, Robert E. Kahn, "A Protocol for Packet Network Intercommunication", IEEE Transactions on Communications, Vol. 22, No. 5, May 1974 pp. 637-648
* 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 signalin read more at » http://en.wikipedia.org/wiki/Voice+over+Internet+Protocol
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