We are using CISCO 2821. The system started to have problem connecting to voice mailbox (when dialing internally to the VM extension) and it used to take a reboot to bring it back. Now it will not connect to voice mail (gets fast busy signal), plus incoming calls get a fast busy signal after the first ring tone. To make it worse, the Call Manager Express web page does not load. Does anyone have any idea how to solve the problem? Thanks!