When we undo the call forward all option on one of our 7960's it still displays that the call are been forwarded (as per the attachement). Calls can be received and outgoing calls can be made from this phone without an issues, it's just that the display says that the calls are been forwarded.
I have also given below the config on our Unity express gateway for this phone.
type 7960 addon 1 7914 2 7914
button 1:47 7:58 8:31 9:32 10:33 11:34 12:42 13m2
button 14m3 15m5 16m25 17m7 18m8 19m9 20m10 21m11
button 22m12 23m13 24m14 25m15 26m16 27m17 28m23 29m24
button 30m41 31m21 32m22 33m26 34m27
label Reception Prime
name Reception Prime
call-forward busy 1060
call-forward noan 1060 timeout 30
hold-alert 30 originator