Built-in sound (CoreAudio) telephony device in Mac OS X?

Is there asterisk support for a telephony device based on built-in sound on
Mac OS X ? I coulnd’t find any. I tried to compile the Linux OSS telephony device using an OSS emulation library on Mac OS X, but with no success.

With support for Mac OS X built-in sound through the CoreAudio API it should be fairly easy to implement a Skype-to-SIP gateway using virtual sound devices such as soundflower.