This company offer Caller ID and Answering Machine for free . But with their service, even when your phone is connected to the internet, when somebody calling, their phone number and name will pop up from your computer screen. Not just this, the caller can even leave their message to you. Click on the Image to register your free account. You may use it to call all toll free phone with out any charge.
Sound quality is acceptable.
However due to this company's Good Free Service to all the interent user for almost 2 years in the past, I still add it's listing here. Using DialPad without any program install to make very Cheap phone call to 200 countries over the world. No Program needed. MediaRing is a PC to Phone service. Check out the rate and compare it's service with other phone company list on this page.