Yealink SIP-T48G - Manual (Page 117)

Basic Call Features
107
5) (Optional.) Enter the no answer forward on code or off code respectively in
the On Code or Off Code field.
4. Tap the Save soft key to accept the change.
The icon on the idle screen indicates the call forward is enabled.
To enable call forward in custom mode:
1. Tap ->Call Features->Call Forward or press when the phone is idle.
The touch screen displays a list of accounts registered on the phone.
2. Tap the desired account.
3. Tap the desired forwarding type.
4. Depending on your selection:
a.) If you tap Always Forward:
1) Tap the On radio box of the Always Forward field.
2) Enter the destination number you want to forward all incoming calls to in
the Forward To field.
3) (Optional.) Enter the always forward on code or off code respectively in the
On Code or Off Code field.
You can also enable always forward for all accounts. Do the following: