Today I would like to present you a really helpful app for the Mac. Telephone is, at the name seems, a small and easy to use SIP-Client. You don't have to hustle with complicated configurations or interfaces where you don't know where it's safe to click. Telephone is reduced to the max and does not have any other features than taking and receiving calls. Perfect!

It has a complete implementation of the address book and can be configured to use different accounts at once. Sorry there's no more to say about it. Just download it and start calling! Oh wait, it's freely available (even the source!) for Leopard and Snow Leopard. Have fun!