List the current known device states.
This will list out all known device states in a sequence of DeviceStateChange events. When finished, a DeviceStateListComplete event will be emitted.
Action: DeviceStateList ActionID: <value>
ActionID- ActionID for this transaction. Will be returned.
This documentation was imported from Asterisk Version SVN-branch-13-r420538
Available only if res_manager_devicestate.so is loaded