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Short for Voice over Internet Protocol, 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 than by traditional circuit transmissions of the PSTN. One advantage of VoIP is that the telephone calls over the Internet do not incur a surcharge beyond what the user is paying for Internet access, much in the same way that the user doesn't pay for sending individual e-mails over the Internet.
There are many Internet telephony applications available. Some, like CoolTalk and NetMeeting, come bundled with popular Web browsers. Others are stand-alone products. VoIP also is referred to as Internet telephony, IP telephony, or Voice over the Internet (VOI)
See "The
Difference Between VoIP and PSTN Systems" in the
Did You Know... section
of Webopedia.
Also see the
VoIP
Meets WiFi article in the Did
You Know? section of Webopedia.
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 Enterprise VoIP Planet
The IT Manager's Guide to Voice over IP
Healthy VoIP Nets - Quality of Experience
A new process, called Quality of Experience, endeavors to go beyond voice to include video and IPTV connections, plus taking into account the effect that the end-user applications may have on the end-to-end connection.
Securing VoIP Networks, Part 1
SBCs are network elements that are deployed at the border between packet-based networks to manage the signaling and media messages that support Internet multimedia services (for example, voice or video). For example, they can be placed between service providers in a peering configuration or in an access network that provides VoIP service to residential or enterprise customers.
Six Steps to Getting Your Network Ready for Voice over IP
Using low bandwidth CODECs helps reduce bandwidth requirements however due to the overhead of IP, UDP and RTP protocols, such reduction is limited.
What SMBs Need to Know About VoIP
Replacing existing internal phone systems with VoIP networks can cut costs, simplify administration and enable a variety of new applications that improve collaboration and productivity.
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