Unity Express AA Transfer no Ring-back - Perception is Key!

This one was a very funny one and I’d like to share with you. After an install of a remote office using the following equipment: CIsco 2901 with an ISM for CUE and an AutoAttendant that when the office is open sends the call to a Hunt Group in CUCM and when they are close the **AA (**prompts) really kicks in. Nothing too crazy right? After 1 month of the installation received a call that when someone calls the main number they hear not ring back (only death air) until someone answers the call. After this one I had few things to look at but I knew this was a cosmetic issue.