asterisk users - Jan 2010 - AOC advise of charge

My Asterisk PBX is connected to 2 ISDN lines by a PATTON gateway, in the 
Patton specification is written that can manage the AOC message.
I would like record the AOC value on the mysql's CDR table, so to record 
the call costs.
Is there some one who has manage this issues and can give me help to 
configure the patton and Asterisk?

Many thanks in advance