{HEAD ~ This function} detects {TAIL ~ Multi Frequency tones} and generates MF and call processing tones  
detects
{ HEAD ~ This function } detects { TAIL ~ Multi Frequency tones } and generates MF and call processing tones
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH