With our VOIP service you can talk to anyone, anywhere for free.Free VoiceMail.
VoIP service is for making high-quality calls using your computer and an Internet connection. Calling any other VoIP user, anywhere in the world, is free.
With our VoIP service you can talk to anyone, anywhere for free.Forever.VoIP is free and easy to use.All you need is Internet access - wired or wireless. You can use your computers speaker and microphone, a headset or bring your own SIP compatible Internet Telephony device. Tell all of your friends and family and eliminate your phone bill. The revolution is here. You can now make unlimited Internet phone calls with perfect voice quality to anywhere in the world at no charge!

In short: practically all home computers can run VoIP and if you pick up a headset, you're good to go!
The long story: You need a computer, a sound card (full-duplex is best), microphone (built-in or external) and speakers or headset. You'll get the best results if you go out and spend 10-20 Euro/USD on a headset with microphone, most computer or electronics stores carry these items.
You need a computer headset, not a telephone headset. A computer headset has two separate connectors one for the microphone, and one for the speaker (some newer headsets connect via USB, these are typically a bit more expensive but in general quite good).
A computer headset has two separate connectors - one for the microphone, and one for the speaker (some newer headsets connect via USB, these are typically a bit more expensive but in general quite good). Also make sure that the headset has a microphone. Y
Many computers have built-in speakers and microphones, but in order to have the best possible quality we recommend our users to use a headset.
A headset is a piece of hardware composed of a microphone and 1 or 2 speaker/s. There are different models.
We recommend you to check that the headset is correctly plugged-in. You should also try to record a voice in order to see whether the mic works, Open Start->Programs->Accessories->Entertainment->Sound Recorder.
Sorry to state the obvious, but please make sure you have a microphone and speaker connected to your computer and that they are working properly.
All incoming calls will go to your voicemail box If you are already talking to someone else.
If currently you are using a non full duplex sound card, please update to a full duplex sound card.