Yealink SIP-T56A User Manual page 279

The touch screen prompts "Copy to all lines?".
Tap OK to accept the change or Cancel to cancel.
2)
c) If you select No Answer Forward:
Tap the On radio box in the No Answer Forward field.
1)
Enter the destination number you want to forward unanswered incoming calls to
2)
in the Forward To field.
Tap the After Ring Time field.
3)
Tap the desired ring time to wait before forwarding from the pull-down list.
4)
The default ring time is 12 seconds.
(Optional.) Enter the no answer forward on code or off code respectively in the
5)
On Code or Off Code field.
Basic Phone Features
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