To Set Up Automatic Callback:
1. Call a local telephone number and receive a busy signal.
2. Depress the switchhook for about one second.
3. Listen for a dial tone.
4. Press *77.
5. The last number is redialed. If the number is available, your call is completed. If the line is busy, a recording notifies you that your telephone will ring the dialed number when it becomes available.
6. Hang up the phone.
7. When the line is free, you will hear two short rings on your phone. Pick up your phone and the other line will ring.

To Cancel Automatic Callback:
1. Lift the handset.
2. Press *86.
3. A recording notifies you that it is cancelled.
4. Hang up the phone.