Everybody gets this wrong

Sorry if I am being "anal" ;-) I worked for "The Phone Company" (AT&T/Lucent) for 12 years but I knew this before also. When a caller calls a callee, the caller controls the call. If the callee hangs up first, and the caller does not, the call stays up for a short time. Not sure exactly how long. 5 seconds? 10 seconds? Anyway, every tv show / movie, including this one, where someone calls someone, and the callee hangs up, the caller gets dial tone instantly. That just doesn't happen. At least not in the seventies.