ATCOM 5520 User Manual page 62

There are 9 function key on the phone, and be expanded to 29 with expander
board.There are 5 types of the key:
1.NONE: do not use this key
2.Memory Key: set Number@Line/Subtype for the key,the number will be send
out if you press the key.
Number@Line/b: BLF (need server support). You can see the status of the
blf number you set.When the key is green,means the number is free now.
When the key turns red and blink,means the number is ringing. When the
key turns red for steady,means the number is in a conversation.
Number@Line/m: MWI,like the voice mail key.The key will blink if there is a
new voicemail.
Number@Line/p: Presence(need server support).You can see the register
status of the number.
Number@Line/f: Speed Dial
Number@Line/i: Push to Talk(need server support)
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