Access list & chat

Dear all, I need to restrict my users to be able to use all chat sevrices and have no browsing or ftp things, how do you think i can built my access list to do so? Do I have to mention host addresses or I can control it through opening access to specific ports only> Thanks for your help Ref

Enabling IPSec on 12.0(7)t

Dear All, I'm trying to have IPSec connection to my router from another one. but the command crypto is not available. The current IOS ver is 12.0(7)t and I found on Cisco that version supports IPSec. Any idea why I can't use such command? Best regards, Ref