Aastra M401 User Manual page 10

1.1.2. The internal extension is busy
Automatic redial
If the extension you are trying to reach is busy, you can automatically redial the number.
Press the key
Then the key
You will hear a beep to let you know that the redial function has been activated.
.
Hang up.
As soon as the extension you called hangs up, your extension rings. When you pick up your
handset, the extension you called also rings.
You are now through with your party.
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