Most programs and services have dial pad interfaces. Most of the interfaces also have such features as volume controls and address books. But of course there is a catch. The quality of online calls is not as good as that of actual phone calls. Internet phone calls usually sound about as good as a typical cellular phone call.
Several factors affect the quality of calls online.
Perhaps the most important is the speed at which you connect to the Internet. That's the delay between the time someone speaks and the person on the other end hears what they've said. Usually it's not more than a second or so, but it still can be a bit disorienting, especially for new users. A simple way to improve the quality of online phone calls is to use a headset. The quality of a headset will almost certainly be better than the cheap plastic microphone that came with your computer.