Charge info

Hi all, Sorry for posting in english, but my German sucks... I've got a small problem with an ISDN connection hanging up too soon under SuSE 7.0. I run 6.4 here and it's fine. I've set the idle timeout to 30 minutes, but it seems to hangup before this, at different times. Looking at the logs it seems to be to do with the call charging. The message I get is something like (I forgot to bring the file back to the office :-) Hint: LCR Failed normal call clearing. I am in the UK, so the charging databases aren't useful anyway, and all the values are in DM! How do I stop the ISDN system doing this? Is it possible to still log the calls and produce reports if the charging is disabled? Thanks in advance. Mark.