This is a software publisher's description.

Firefly is a fully featured softphone with instant messaging and voicemail for home, businesses, schools and other organisations. It lets anyone with a microphone and speakers or a USB handset communicate.

With an easy to use interface, use your firefly address book to contact your friends, locally or worldwide for free once the software is installed using voice over IP technology.

You also get instant messaging to other Firefly users, as well as your own Voicemail box so people can leave you a message when you are unavailable or not on the Internet - for free. Finally, you can call traditional phones both nationally and internationally, however the price of these calls are based on usage charges.