After the first azhan of Jum’ah and before the second azhan, four rakats of sunnah salah should be offered. This sunnah is sunnah-mu’akkadah. After the khutbah, two rakats fard Jum’ah salah should be offered with the imam. Thereafter, four rakats sunnah should be offered. These are also mu'akkadah. Thereafter, another two rakats should be offered. According to some ulama’ these two rakats are also sunnah-mu’akkadah.