The caller ID extracting part analyzes {TAIL ~ a call incoming signal} and extracts {HEAD ~ an area code} as the caller ID information 
The caller ID extracting part analyzes { TAIL ~ a call incoming signal } and extracts { HEAD ~ an area code } as the caller ID information
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH