The present invention provides {HEAD ~ a tone detector} and a method for detecting {TAIL ~ a multi frequency tone} as described in the accompanying claims 
The present invention provides { HEAD ~ a tone detector } and a method for detecting { TAIL ~ a multi frequency tone } as described in the accompanying claims
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH