asterisk users - May 2007 - Error messages in console : sipsock_read: SIP MESSAGE JUST IGNORED:

I have googled this, and have come up with blanks.  Someone told me it 
was a bug, and I read in one forum, that these errors were because of 
poorly configured .conf files, but, it gave no clue as to what are to 
look in.

Any help would be appreciated.

Thanks

Don Fletcher