Callback checkbox_property

Example: Show menu item if phone has/doesn't have the checkbox property

<?xml version="1.0" encoding="UTF-8"?>
<SnomIPPhoneMenu>
 	<If condition="$(checkbox_property)==available">
		<MenuItem name="checkbox property available"></MenuItem>
 	</If>
 	<Elif condition="$(checkbox_property)==none">
 		<MenuItem name="no checkbox property"></MenuItem>
 	</Elif>
 	<Else>
 		<MenuItem name="unknown checkbox property"></MenuItem>
 	</Else>
</SnomIPPhoneMenu>

Result on Snom D745:

Result on Snom D375:

• Page:
  Boolean Callbacks
• Page:
  Callback arch_series
• Page:
  Callback bool_eval
• Page:
  Callback checkbox_property
• Page:
  Callback condition
• Page:
  Callback create_url
• Page:
  Callback current_input
• Page:
  Callback current_line
• Page:
  Callback date
• Page:
  Callback display_type
• Page:
  Callback empty
• Page:
  Callback enum
• Page:
  Callback fragment
• Page:
  Callback get_cmd
• Page:
  Callback lang
• Page:
  Callback lines
• Page:
  Callback list_size
• Page:
  Callback math_eval
• Page:
  Callback max_registrations
• Page:
  Callback mod_ifc
• Page:
  Callback on_off
• Page:
  Callback phone_state
• Page:
  Callback remove_cmd
• Page:
  Callback set
• Page:
  Callback setcache
• Page:
  Callback show_feature
• Page:
  Callback status_message
• Page:
  Callback time
• Page:
  Callback urlencode
• Page:
  Callback user_displayname
• Page:
  Callback var
• Page:
  Callback var_ifc
• Page:
  Callback wifiscan
• Page:
  Callback wlang
• Page:
  Callbacks
• Page:
  Callbacks edit_mode and next_edit_mode
• Page:
  Callbacks for function keys
• Page:
  Callbacks sel and lastsel