i don't know how to upload the gui files to the 2821 IP pbx.
i set up a tftp server and i'm able to upload firmwares but the "archive tar" command isn't working.. any help ?
TFTP the tar file to the router to make sure that the router actually can get to that file and that there isn't some crazy computer thing going on. What version of IOS, model of router, and TFTP client are you using? I am going to try it here...