Bismillah What Sidi Salslams says is correct. Ibn Hajar al-Haytami mentions that it is mustahhab to recite salawat after the Adhan [which is backed by unambigious hadith], and after the Iqama. However, Imam Zaynuddin al-Malibari attributes to Imam al-Nawawi that it should be done before Iqama, and it has been said that this was a mistake on his part, and that what was meant is after the Iqama. Wa Allahu a'lam.