Yealink SIP-T28P - Manual (Page 105)

Basic Call Features
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2) Press the All Lines soft key.
The LCD screen prompts “Copy to All Lines?”.
3) Press the OK soft key to accept the change or the Cancel soft key to cancel.
b.) If you select Busy Forward, you can enable it for a specific account.
1) Press or , or the Switch soft key to select Enable from the Busy
field.
2) Enter the destination number you want to forward incoming calls to when
the phone is busy in the Forward To field.
3) (Optional.) Enter the busy forward on code and off code respectively in the
On Code and Off Code field.
You can also enable busy forward for all accounts. After busy forward was
enabled for a specific account, do the following:
1) Press or to select the Busy field.
2) Press the All Lines soft key.
The LCD screen prompts “Copy to All Lines?”.
3) Press the OK soft key to accept the change or the Cancel soft key to
cancel.