Im trying to block google talk but i am not able to succeed,
heres what I did, disabled port 5222, still nogo, addeded gtalk regxp on L7 filter via winbox (^<stream:stream to="gmail\.com")
also added jabber as well,also I disabled access to talk.google.com, is there any other things I need to do? thanks

I finally solved it, blocking only the port is not enought , so I added the dst address:209.85.229.125, blocked port 443 and 5222 and it gtalk is not working anymore.. I had to remove the L7 filter for jabber and gtalk since it didnt help.