They didn’t answer the phone or the line was busy and you don’t want to remember to call again. The solution is Automatic Call Back. If the number you wish to call is busy, the switch will monitor your phone and the line you last called until they both become available. Once both lines are not in use, you will be given a ring back. When you answer the call, the other party’s phone will ring and the calls can be connected.
To activate Auto Recall, dial *66
To cancel all outstanding callback attempts, dial *86