Hmmmm? 1st: Ghost Call recommends ZRTP media encryption 2nd: ZRTP hash allows a MITM (Man In The Middle) and creates a risk of decryption. Why recommend it t

Hmmmm? 1st: Ghost Call recommends ZRTP media encryption 2nd: ZRTP hash allows a MITM (Man In The Middle) and creates a risk of decryption. Why recommend it then? Am I missing something?