The Musaph Amidah is said without a full repetition, in the same way as weekday Minha. The hazzan reads the first three blessings, with Kedusha, aloud. He then says the middle blessing in silence while the congregation finish their entire silent Amidah. He then says the closing words of the middle blessing (“Mekadesh Hashabat”) and the last three blessings aloud.