I was able to get the F13 version (asterisk-1.6.2.0-0.6.rc3.fc13.i686) of asterisk working on F12. I was also able to get dahdi-linux working using the trunk from Digium (some kernel build opts changed since 2.6.30 which break 2.2.0.2) and a spec file from messinet.com with very minimal changes.