My VOIP is mynetfone. I have used it since 2006. It is a good service. I have a supersave account, pay as you go, no monthly fee. Price is very fair. Local and std calls cost 10 cents. It has web SMS service, global access call-back, global access call-in. but things needed are: a local call numbers in some regions (ie Armidale), web call connection interface etc. Both Ekiga and Twinkle at linux handle this voip well.