Asterisk rtupdate

Probably wasting my time asking this question, but anyway…

I’ve got sip.conf in asterisk realtime. I’ve set rtupdate=yes in sip.conf, but upon registration asterisk isn’t sending the registration to the database. I’m watching my mysql server with a network analyser and Asterisk just is not sending an INSERT command. Any ideas? Thanks.

Also, when I stop and start asterisk, it doesn’t load user registration information from the database. Why???

AND … I’ve also got rtcachefriends=yes and the database (ie /var/lib/asterisk/astdb) is not being updated. What gives? Does realtime actually work?