I believe that Cisco uses the local16-23, which roughly equates to local0-7 on *NIX.
In the past when I completed similar configurations I would use something like:
CISCO:
logging on
logging trap debugging
logging host
logging facility 20
*NIX:/etc/syslog.conf
*.debug;LOCAL4.none /var/log/messages
LOCAL4.* /var/log/cisco-messages
If you really want to get creative you can take a look at syslog-ng.
TM