What is the dhikr (remembrance of Allah) prescribed after the adhan (call to prayer)?

Question:
Is the supplication for the wasilah (means of nearness) and fadilah (excellence) for the Messenger (peace and blessings be upon him) recited after the adhan or after the iqamah (second call)?

Answer:
After the adhan, the Messenger (peace and blessings be upon him) said: So say what he says, and this is following the mu'adhdhin (caller to prayer). When the mu'adhdhin finishes and you have followed him, you pray upon the Prophet (peace and blessings be upon him) and say: O Allah, send blessings upon Muhammad and upon the family of Muhammad. O Allah, grant Muhammad the wasilah and the fadilah, and raise him to the honored station that You promised him. The Messenger (peace and blessings be upon him) said: Yes.