Yealink SIP-T48G - Manual (Page 115)

Basic Call Features
105
You can enable/disable call forward for the phone system, or you can customize call
forward for each or all accounts. Two call forward modes:

Phone (default): Call forward is effective for the phone system.

Custom: Call forward can be configured for each or all accounts.
To configure the call forward mode via web user interface:
1. Click on Features->Forward & DND.
2. In the Forward block, mark the desired radio box in the Mode field.
3. Click Confirm to accept the change.
Note
To enable call forward in phone mode:
1. Tap ->Call Features->Call Forward or press when the phone is idle.
2. Tap the desired forwarding type
3. 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
Call forward mode is configurable via web user interface only.