In all my years in RB, I have played with players who call their own carries. It's a choice and the best choice to play fair for everyone.
You just have to be honest and aware when you carry the ball in RB.
A carry can be when the ball is caught between the strings and the frame and doesn't bounce off the strings, but is "carried" like throwing a ball.It's very distinct and easy to see as an opponent and feel as the player carrying the ball. Then, there is the second type of carry where the ball is hit by the racquet more than once (a double-hit).