The ruling on announcing the prayer after the adhan

Is it permissible for the mu'adhdhin, after the adhan through the microphone, to announce the prayer after he has finished the adhan?
The best of guidance is the guidance of Muhammad (peace and blessings be upon him). The Prophet (peace and blessings be upon him) informed the people of the prayer by the adhan only. So any words added after the adhan are a religious innovation (bid'ah). One does not announce after it; it is sufficient to say "Hayya 'ala al-salah, hayya 'ala al-falah."