I am trying to get the CallBack feature working. When I try to test the feature I recieve the error message "CallBack can not be activated on xxxx". I've tried the feature on a couple of phones and receive that error message every time. What I search Cisco's Knowledge Base the only thing listed is to retry or the directory number(s) must be added to Cisco CallManager Administration. That statement confuses me because these are all valid extensions and I'm not clear as to what the DN needs to be added to. Below is what my environment is running.
-Cisco Extended Functions is enabled
-SoftKey Template has been created for On Hook and Ring Out to enable CallBack feature.