Yealink SIP-T21 - Manual (Page 88)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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3. Depending on your selection:
a.) If you select Always Forward:
1) Press or , or the Switch soft key to select Enable from the Always
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.
b.) If you select Busy Forward:
1) Press or , or the Switch soft key to select Enable from the Busy
field.
2) Enter the destination number you want to forward all incoming calls to
when the phone is busy in the Forward to field.
3) (Optional.) Enter the busy forward on code or off code respectively in the
On Code or Off Code field.
c.) If you select No Answer Forward:
1) Press or , or the Switch soft key to select Enable from the No
Answer field.
2) Enter the destination number you want to forward all unanswered incoming
calls to in the Forward to field.
3) Press or , or the Switch soft key to select the ring time to wait