Yealink SIP-T46G - Manual (Page 113)

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.
c.) If you select No Answer Forward, you can enable it for a specific account.
1) Press or , or the Switch soft key to select Enabled from the No
Answer Forward field.
2) Enter the destination number you want to forward unanswered incoming
calls to in the Forward To field.
3) Press or , or the Switch soft key to select the ring time to wait
before forwarding from the After Ring Time field.
The default ring time is 12 seconds.
4) (Optional.) Enter the no answer forward on code or off code respectively in
the On Code or Off Code field.
You can also enable no answer forward for all accounts. After no answer
forward was enabled for a specific account, do the following:
1) Press or to highlight the No Answer Forward field.