Dua #1012•At-Tirmidhi, Abu Dawud, Ahmed. See Irwaa Al-Ghalil 1/262

Concerning the athan (the call to prayer)

Hisnul Muslim
#1012

يَدْعُو لِنَفسِهِ بَيْنَ الْأَذَانِ وَالْإِقَامَةِ فَإِنَّ الدُّعَاءَ حِينَئِذٍ لاَ يُرَدُّ