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Voice over Internet Protocol, also called VoIP, IP Telephony, Internet telephony, Broadband telephony, Broadband Phone and Voice over Broadband is the routing of voice conversations over the Internet or through any other IP-based network.
Companies providing VoIP service are commonly referred to as providers, and protocols which are used to carry voice signals over the IP network are commonly referred to as Voice over IP or VoIP protocols. They may be viewed as commercial realizations of the experimental Network Voice Protocol (1973) invented for the ARPANET providers. Some cost savings are due to utilizing a single network - see attached image[1] - to carry voice and data, especially where users have existing underutilized network capacity that can carry VoIP at no additional cost. VoIP to VoIP phone calls are sometimes free, while VoIP to PSTN may have a cost that's borne by the VoIP user.
There are two types of PSTN to VoIP services: DID (Direct Inward Dialing) and access numbers. DID will connect the caller directly to the VoIP user while access numbers require the caller to input the extension number of the VoIP user. Access numbers are usually charged as a local call to the caller and free to the VoIP user while DID usually has a monthly fee.[2] There are also DIDs that are free to the VoIP user but chargeable to the caller.
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Voice Over IP
8, VOIP · VoIP, 12. 9, What is Voice Over IP? ... 5, How to use Cisco Call Manager Express with external VoIP company
30-Aug-2007 Hits: 36 Rating: 0.00 Votes: 0
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Viruslist.com - VoIP [Voice over IP]
VoIP [Voice over IP]. VoIP is a technology that lets subscribers to the VoIP service make telephone calls using a computer network that supports IP ...
30-Aug-2007 Hits: 37 Rating: 0.00 Votes: 0
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Hacking Exposed VoIP
He is an expert author and frequent presenter on the topic of VoIP security. Collier is also a founding member of the Voice over IP Security Alliance. ...
30-Aug-2007 Hits: 38 Rating: 0.00 Votes: 0
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