asterisk users - Oct 2006 - newbie astdb error, please help

I am getting this warning:-
Oct 23 15:47:22 WARNING[2124]: db.c:171 ast_db_put: Unable to put value '
192.168.1.12:5060:300:15553695861:sip:23@192.168.1.12:5060' for key
'23'
in family 'SIP/Registry

I checked the file permissions. They are proper. There doesnot seem to be a 
visible error. No change has been done in any conf files for the past 4 months. 

The reinvite has also stopped. I dont have any idea whats happening.