Aastra 9143i Series Administrator's Manual page 936

IP Phone Administrator Guide
Operational, Basic, and Advanced Parameters
Example
The following is an example of configuring the CFWD key mode in the
configuration files:
call forward key mode: 2
softkey1 type: callforward
softkey1 states: idle connected incoming outgoing busy
In the above example, softkey 1 is configured for CFWD on line 1 (account 1)
with a "custom" configuration. Pressing softkey 1 displays CFWD screens for
which you can customize on the phone.
A-150 41-001160-04 Rev 02, Release 2.5