Yealink SIP-T56A User Manual page 280

Smart Media Phone
User Guide for SIP-T56A
You can also enable no answer forward for all accounts. Do the following:
Tap
1)
The touch screen prompts "Copy to all lines?".
Tap OK to accept the change or Cancel to cancel.
2)
Tap and then tap Save to accept the change.
5.
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and then tap All Lines.