Yealink SIP-T19 - Manual (Page 79)

Basic Call Features
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1. Press the OK soft key, the phone returns to the idle screen and call completion is
activated.
When the called party becomes idle, the following prompt appears on the LCD
screen of the phone:
2. Press the OK soft key to redial the number.
Note
You can press a call return key to place a call back to the last incoming call.
To configure a call return key via web user interface:
1. Click on DSSKey->Programmable Key.
2. Select the desired programmable key.
3. Select Call Return from the pull-down list of Type.
4. Click Confirm to accept the change.
Note
Call completion is not available on all servers. For more information, contact your system
administrator.
A call return key is configurable via web user interface only.