That just occurred to me, too. In Georgia one party must know that the call is being recorded. In most other places all parties must know. (Don Imus got his start making prank calls on the radio. This legality put him out of that particular business. Listen to "1200 Hamburgers To Go" for an example.)

There used to be a requirement that a tone must sound at certain intervals to indicate that recording was in progress, but I haven't heard that in decades.

"My primary musical instrument is the personal computer."