Yealink SIP-T21 - Manual (Page 77)

Basic Call Features
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- If you are using the speakerphone, press or the Cancel soft key.
Note
To redial the last dialed number from your phone:
1. Press twice.
A call to your last dialed number is attempted.
To redial a previously dialed number from your phone:
1. Press when the phone is idle.
2. Press or to select the desired entry, and then press or the Send soft
key.
You can view the placed calls list when the phone is in the pre-dialing screen. To do this,
you should enable recent call in dialing in advance.
To enable recent call in dialing via web user interface:
1. Click on Directory->Setting.
2. Select Enabled from the pull-down list of Recent Call In Dialing.
To end a call placed on hold, you can press the Cancel soft key to end the call directly, or
press the Resume soft key to resume the call before ending it.