Archive for the ‘Communications’ Category

About VoIP

Friday, August 7th, 2009

What is VoIP?  Is it useful, or inexpensive? The answer is that VoIP is Voice over Internet Protocol. Voice over the Internet allows connections all over the world. It is one way to have a free pc to phone international call. In other words it is a phone call from pc. Yes, it is useful, and it is inexpensive, especially if you like the word free. Some Voice over Internet service may allow you to only call anyone who has the same service, but some will allow a phone call to anyone with a telephone number including international numbers.

Easy Free PC To Phone International Call
Voice over Internet Protocol allows the converting of your voice into a digital signal that travels over the Internet. If you are calling a regular phone number, using a broadband service, the signal is converted to a regular telephone signal before it reaches the destination.  In layman’s terms you are using your Personal Computer via a modem or phone adapter to connect to the Internet, and the receiving person will answer via PC or telephone. This allows the free pc to phone international call. This all happens with this broadband Internet connection instead of a regular or analog phone line.

The equipment needed to make this happen are a broadband high speed Internet connection.  A computer, adapter or other specialized phone is required. Some Voice over Internet Protocol services only work over your computer or a special VoIP phone, while there are other services that allow you to use a traditional phone connected to a VoIP adapter. If you are going to use your computer as a phone call from pc then you will need to have some software and an inexpensive microphone. Some special VoIP phones plug directly into your broadband connection and operate largely like a traditional telephone. If you use a telephone with an adapter, then you will use the phone like you always have.

In order to make the VoIP free pc to phone international call you must make certain that your Internet provider will allow you to make those calls. It comes down to what your subscription service will allow on their services. Check into that before you decide if VoIP is right for you. One of the advantages of VoIP is that you may be able to avoid paying for both a broadband connection and a traditional telephone line, which will save you money. More so if you are able to make a phone call from pc. If you are traveling overseas or to another country you may take your phone and adapter with you, and connect to another computer. This makes you able to use your same provider to make phone calls back home.

The disadvantages are that the VoIP will not work during power outages and the service provider may not offer backup power. Not all VoIP service connects directly with emergency services such as 9-1-1. Nor will some providers offer directory assistance or white page listings. These seem to be the downfall of having VoIP service. The computer does not have to be turned on for the VoIP to work, but the broadband connection must be active or live. The other piece of news is that you can use both the computer and the VoIP phone service at the same time. Yes, this is one good way of making your free pc to phone international call.

The option is for you to check with your Internet service provider. Make certain you have all software and possible adapters, as well as the broadband connection. With the right equipment you will be able to make a free pc to phone international call. If you are attending school, working overseas, or checking on the family back home, then VoIP is a wonderful tool to connect with loved ones, and special people. This is a way to have your free pc to phone international call. The tools are available. Your next step is to set up your computer and Internet service provider for a Voice over Internet Protocol.

About Botnet

Friday, August 7th, 2009

BotNet, also called zombie network and network of bots is a group of computers which are used to discreetly send data like spam and viruses to other computers on the internet. These actions are carried out by malicious programs without the knowledge of the users. These malicious programs mainly consist of viruses, Trojans and worms. Infected computers are called bots or zombies. Most computers which are infected are personal home internet PCs which are inadequately protected.

When a PC becomes part of a BotNet, it can be instructed to do almost anything by the creator of botnet. In effect it becomes a drone which cannot resist the commands of its master. In this case, the master is the creator of the malicious software (malware). Most Bots are employed in propagation of spam and viruses. Often malware is used for key-press logging which can result in mass identity theft. Zombie computers can also be used for denial of service attacks in which many bots simultaneously log onto a particular server, thus exceeding the server’s bandwidth and crashing it. This technique is particularly effective when the Botnet is large and contains thousands of computers. Many advanced malware can even spread themselves via email while the malware of smaller botnets lack this capability.

BotNets are programmed in such a way that they are difficult to find and analyze. Normally they receive instructions from their creators through IRC (Internet Relay Channels).  As of April 2008, the Storm BotNet and the Kraken BotNet are the largest BotNets in the world with an estimated 400,000 bots. Other significant BotNets are Rbot and Bobax with an estimated 20,000 bots each.

So on a day to basis, the best way to protect your computer properly is to frequently scan and update your antivirus and firewall software. Special sensors called ‘honeynets’ have also been set up on the internet these nets mimic the characteristics of computers with known security flaws in an effort to lure hackers into them and track down malware creators. It has been recently quoted by Kaspersky Labs (creators of Kaspersky anti-virus) that botnets pose more of a threat to the internet community than individual viruses and worms.

‘No Audio Device’ Error

Friday, August 7th, 2009

If you have experienced a Windows “No Audio Device” error, it most likely means that your sound card is not installed properly. Even though other problems can cause this error, an improperly installed sound card is the most common reason. If the audio card isn’t properly connected in the motherboard or you do not have an audio controller connected, you will get this error. Also, it is possible that the device you are trying to use is not compatible to the motherboard you are using.
Troubleshooting the most common error
Here are a few steps to take to solve the most common error, an improperly installed card:
You will first need to find your audio controlling device or controller. This controller is what gives you the ability to adjust the sound for everything. From your start menu, go to your control panel. Then, go to add hardware and search for the hardware yourself. Don’t let the computer search for it automatically, because if it is improperly installed it may not be seen. Then, scroll down to sound devices and search for your audio controller. Check the properties of the device, and see if it is installed properly. If it isn’t installed properly you will see a yellow highlighted question mark beside the device’s name
•    The best way to solve this problem is to uninstall your sound card and drivers. You will reboot, enter the bios, disable the onboard audio, game port, and midi. Then boot back into windows, go to add remove programs and make sure that any programs for the device was removed.
Next, you should reinstall the sound card and drivers. It is possible driver updates have been made since the sound card was manufactured and released, so it is a good idea to visit the manufacturer’s site and see if there are driver updates. Once you do this, restart the computer again. The problem is (more than likely) the default device in audio properties is still the onboard, you can select the creative devices and it will probably work, but it will be better to disable the onboard all together.
Uninstalling and reinstalling the sound card will more than likely fix your problem.
Other troubleshooting tips
If you are still experiencing difficulties, try these other troubleshooting ideas.
•    If you think your sound card may be ‘dead’, before buying a new one, I would recommend borrowing one that is fully functioning from a friend, if possible, and installing that one to see if the error is in the card itself.

•    Try using a different PCi slot, that way windows may detect it as new instead of trying to reconfigure it on the slots its currently on. This can also help you to determine whether one of the slots are bad.
•    If you have an onboard sound card but are trying to use a sound card you bought separately, ensure the onboard one is disabled.
Always ensure the sound card you purchase is compatible with your board. If it doesn’t say on the packaging, do a little research online prior to the purchase.