To enable it, pick up phone, dial * * * * then 723646# , when asked for
password, dial 78778839# , when asked for value dial 1# then dial 1 to
save.

If gizmo behind router, you also need to enable access from WAN side
with option 7932# . Of course, substitute gizmo WAN address in above
URL. To hear it, use option 110#