Automatic Ring Back 

Automatic Ring Back – Normally, when a line is busy, you try redialing every few minutes. With automatic ring back, a code is dialed into the telephone keypad to enable the phone to notify you with a ring when your call goes through. Your phone will ring with a distinctive ring, so you know it’s an automatic ring back. When you pick up the phone, it redials the number, so you can complete your call.

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