Authentic Supplication Number 66.

The Messenger of Allah  said: Supplications are not turned down between the Athan and the Iqamah.

Al-Albani said this hadeeth was sound, that Ibn Khuzaymah, and Ibn Hibban said the like, and that Ibn Hajar agreed with them in his Nata’ij al-Afkar. Al-Albani included this hadeeth in The Authentic of Good Sayings as 59.