We study efficient, deterministic interactive coding schemes that simulate any interactive protocol both under random and adversarial errors, and can achieve a constant communication rate independent of the protocol length. For channels that flip bits independently with probability < 1/2, our coding scheme achieves a communication rate of 1 − O( H( )) and a failure probability of exp(−n/ log n) in length n protocols. Prior to our work, all nontrivial deterministic schemes (either efficient or not)