Synopsis:

       num_items=SMdetected(vox_chan[,type])

Arguments:

       vox_chan – The voice channel

       type – Set to 0 to return the number of DTMF digits, 1 to return the number of other recognition events detected.

Description:   This function allows for the number of DTMF (if type=0) or other recognition events (if type=1) that have been received on the specified vox_chan.

Returns:   Returns the number of detected items in the appropriate channel buffer depending on the type argument,  else returns -1 if an invalid channel was specified.