Zoiper Softphone 2.0

This program is a converged Internet communication tool combining high-quality voice and video calls, fax, instant messaging and presence through a contact-centric intuitive interface.

With Zoiper Communicator you can make and receive high quality voice and video calls though multiple SIP and IAX accounts and lines while confident in the security of your conversation, chat send and receive instant messages (securely encrypted), set your presence (status).
Zoiper Communicator runs on Mac OS X.