Synopsis:

       SMclrASRitems(vox_chan) {

Arguments:

       vox_chan – The voice channel

Description:   This function allows for the current set of vocabulary items to be cleared on the specified vox_chan.       Note that the previous set of vocabulary items will still be active on the vox_chan if a previous call was made to SMctlASR() with a vocabulary set defined and the off_on_cont flag set to 1 or 2.         To stop ASR events from being recoignised then a call to SMctlASR() should be made with off_on_cont flag set to 0.

Returns:  Returns 0  if successful or a negative error code.