From Om Malik’s weblog:
If you love OS-X, then there is more good news coming your way, thanks to yeoman’s effort by Benjamin Kowarsch, the genius who developed an OS-X installer for Asterisk, the open source PBX system. (You can download it from here!) VoIP Weblog points out that Benjamin is now leading an efforts to create device drivers for Digium’s Zaptel telephony cards. The stability and ease of use of the OS-X platform, makes it ideal for VoIP some believe. More here! Also check out Scott’s primer on how to use Asterisk with the OS-X Address Book, and making cheap phone calls. It is not going to be easy, but quite do-able.