Sending blessings upon the Prophet (peace and blessings of Allaah be upon him) during Jumu’ah
Question

                I know that when Prophet Muhammad's (salallahu 'alaihi wa salam)name is mentioned we say "Salallahu 'alaihi wa salam", but I also know that during Jumu'ah we are not supposed to speak or we lose our reward.  If the Imam mentions Prophet Muhammad's (salallahu 'alaihi wa salam) name what is the best thing for us, as muslims?  Are we exempt from sending peace upon our beloved messenger at that time or should we say it to ourselves?.
Praise be to Allah.Imam Ahmad said: There is nothing wrong with 
    sending blessings upon the Prophet  (peace and blessings of Allaah be upon him), saying that to oneself. Al-Mughni, 2/165 ff. 
The Standing Committee said: 
If the khateeb sends blessings upon the Prophet  (peace and blessings of Allaah be upon 
    him) then the listener should do likewise without raising his voice. 
Fataawa al-Lajnah al-Daa’imah, 
    8/217. 
Shaykh Ibn ‘Uthaymeen said: 
If the khateeb mentions the Prophet  (peace and blessings of Allaah be upon him), then the 
    listener should send blessings upon him silently, so that he does not disturb the people around him.  
Majmoo’ Fataawa Ibn ‘Uthaymeen, 
    16/166.