Is it obligatory for the worshipper to invoke blessings upon the Prophet (peace be upon him) at the end of the qunūt supplication during the dawn prayer?

According to the Maliki and Shafi'i schools of thought, the Qunut in the Fajr prayer is a Sunnah (definition). The Shafi'is also recommend sending prayers and salutations upon the Prophet, his family, and his companions during the Qunut. If one intentionally or unintentionally omits it, prostration of forgetfulness (Sujud (definition) as-Sahw) is recommended for him. Praying upon the Prophet is not obligatory for the congregant (ma'mum) or the imam during the Qunut.