canada formerly used a us-style acts coin phone system with a tone pair which would beep once for a nickel, twice for a dime and five times on receiving a quarter. these phones did not accept $1 coins (or the later $2 coin) and disappeared with the roll-out of nortel millennium payphones in the 1990s. the millennium sets do not use acts in-band signalling tones as all coin-handling is automated in the phone itself.