Several Methods.
Basically, CF I am Here creates and always forward condition from the designated set to the activating set.
Any action that will cancel Call Forward Always on the originating set will work.
FAC - Cancel Forward All, dialed from Analog set
FAC - Cancel Call Forward Follow Me, dialed from analog set
FAC - Cancel Call Forward Follow Me Remote, Dialed from 4025
FAC - Cancel Call Forward Third Party, Dialed from any enabled set
A console may be able to cancel te forwarding as well, but one of the abave should get you there.
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Occam's Razor - All things being equal, the simplest solution is the right one.