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How Does VoIP Service Work?
By Simon Ahtung
VOIP technology is a one way of sending a voice signal also known as an analog signal in a medium which is digital, i.e, the internet. In practice, the process works like this when you have a standard analog telephone attached to your high speed internet connection with VOIP service. There will be an analog telephone adapter or ATA between the phone and the computer.
In order to place what would normally be a long distance call to a person who doesn't have VOIP service you key in the number you want. The analog telephone adapter converts the touch tones into a digital format. The digital phone number is sent by the analog telephone adapter to the VOIP routing system at the service provider's location. The VOIP service provider is located on the internet as well.
The VOIP service provider's routing system identifies the recipient's location and sends the call to the Public Switched Telephone Network (PTSN) at that location. The phone rings at the other end and the conversation can begin. Each time you speak, the analog to digital converter in the analog telephone adapter changes the voice tones into packets of digital information that can be transmitted across the internet. When the VOIP service meshes with the Public Switched Telephone Network at the recipient's end, the digital packets which are the voice tones from you get turned back into an analog signal so that you recipient of your call can understand what you are saying.
The reverse process, i.e. the transmission of what the other person says to you is a mirror image of the first process. Their voice is transformed from analog to digital when it gets to the PSTN/internet connection. The digital packets are sent to the analog telephone adapter at your location where they are converted back into an audible or analog signal to be able to perceive the voice as that of your caller.
The technology to do the conversion from analog to digital and back again has been around as long as digital electronics. For example, your PC sound card converts digital CD information to analog signal needed by the speakers on your computer. The difficult part of the VOIP technology is the necessity to smoothly transmit the digital data over the internet and reassemble it in a continuous stream. This is know as the protocol.
When listening to voice transmission, there can be no gaps in the stream of digital packets or the voices will not be understandable. This part of the technology has only recently been available, but is actually equal or better in quality than you get with standard telephone networks.
The equipment available today that uses VOIP technology can be an analog telephone adapter for your head set through the computer. There are a few VOIP phones that act like a regular analog telephone but have the ATA incorporated into the phone. It's actually a small dedicated personal computer in your telephone. These VOIP phones can be plugged into the computer with high speed internet connection or into the router.
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Denial Of Service In Voip News
JAJAH Delivers Wholesale VoIP Services with Acme Packet - WELT ONLINE
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Jajah deploys Acme Packet's Net-Net session border controllers - Trading Markets (press release)
Jajah deploys Acme Packet's Net-Net session border controllers Trading Markets (press release), CA - ... including denial-of-service attack prevention, access control lists and signaling rate limiting to protect Jajah's core service infrastructure. ... |
NETGEAR Launches New Series of Versatile Wireless Routers Designed ... - PR Newswire (press release)
NETGEAR Launches New Series of Versatile Wireless Routers Designed ... PR Newswire (press release), NY - It supports SPI, intrusion logging and reporting, denial-of-service (DoS) protection, up to five IPsec VPN endpoints, and NAT. With Push 'N' Connect with ... |
LSI's Chipset Solution to Ease Integration Between IP Apps ... - TMCnet
LSI's Chipset Solution to Ease Integration Between IP Apps ... TMCnet - ... at LSI’s Network Components Group, VoIP performance can degrade rapidly due to IP network congestion, denial of service attacks or local disasters. ... LSI Announces FXO Solution for Implementing Higher Availability ... |
Acme Packet to Support Korea Cable Telecom Expansion - TMCnet
Acme Packet to Support Korea Cable Telecom Expansion TMCnet - ... Net-SAFE, that offers capabilities such as denial of service (DoS) attack prevention, topology hiding and access control to protect KCT's VoIP core. ... |
Unify Network Protection in the Enterprise - NewsFactor Network
Unify Network Protection in the Enterprise NewsFactor Network, CA - The BreakingPoint system delivered a strike level 5 test that included exploits, network worms, denial-of-service attack, reconnaissance attacks, ... |
MTS Allstream Deploys Acme Packets Net-Net SBCs - TMCnet
MTS Allstream Deploys Acme Packets Net-Net SBCs TMCnet - In order to protect MTS Allstream's VoIP core and ensure network availability, the Acme Packet's security framework, Net-SAFE, provides denial of service ... |
DHS: Remarks by Secretary Michael Chertoff at the Cyber Strategic ... - TMC Net
DHS: Remarks by Secretary Michael Chertoff at the Cyber Strategic ... TMC Net, CT - And then the third kind of problem, which is a little similar to denial of service, is corruption of the process -- not an attack that necessarily destroys ... |
Firefox tops list of 12 most vulnerable apps - ZDNet Blogs
 ZDNet Blogs | Firefox tops list of 12 most vulnerable apps ZDNet Blogs - The Safari for Windows browser was haunted by three flaws that could be lead to arbitrary code execution and denial of service involving JavaScript arrays ... |
NIST finds security problems with overseas e-voting - ITworld.com
NIST finds security problems with overseas e-voting ITworld.com, MA - Web-based voting could use encryption to guard against data leaks, but denial-of-service attacks powered by botnets are still a potential problem. ... |