Is it possible to do PC-To-Phone calls using Ekiga?
Yes. You simply have to register an account to the Ekiga provider from the PC-to-Phone configuration window accessible from the Tools menu. You do not need any specific hardware to be able to do PC-to-Phone calls: a simple soundcard is enough. Using a headset to avoid echo problems is however highly recommended. Please see the appropriate section of this FAQ for information on obtaining an account.