The OpenHandset and CloseHandset entries define the AT commands used to access the handset.
OpenHandset puts the modem into a mode that allows audio (wave files) to be played to the handset. CloseHandset resets the modem to class 0.
One or more command strings.
HKR, OpenHandset, 1,, "at#cls=8<cr>" HKR, OpenHandset, 2,, "at#vls=1<cr>" HKR, CloseHandset, 1,, "at#cls=0<cr>"
These commands are used to play audio through the handset while there is no active call.