Go to the path: Phone->Ext Key to see the configuration of each Ext key. Allow
user to assign specific feature to the designated Ext key. For Ext key, the available
feature list: DND, Menu, MSG, Status, Book, Fwd, PickUp, Group PickUp,
Intercom, Speed Dial, History, Favorites, Redial, Account, ACD, BLF, BLFList, Call
Return, Hot Desking, Record, XML Browser, DTMF.
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