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Notifies you that a previously dialed on-campus number (with a busy tone) is now available.
To Activate
When you receive a busy tone, press the Call Back soft key. The phone will indicate that Call Back has been initiated against the DN just called. You are now free to make any other call.
Once the far end goes idle, your set will play a special ring tone to let you know that the DN has become available and a new Dial soft key will be displayed. Press it and it will redial the original number for you.