Bilal was commanded to announce the Adhan (each phrase) twice and the Iqamah (each phrase) once except "The prayer stood ready to begin" (to be pronounced twice).
عَنْ أَبِي مَحْذُورَةَ - رضى الله عنه - { أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -عَلَّمَهُ اَلْآذَانَ, فَذَكَرَ فِيهِ اَلتَّرْجِيعَ } أَخْرَجَهُ مُسْلِمٌ. وَلَكِنْ ذَكَرَ اَلتَّكْبِيرَ فِي أَوَّلِهِ مَرَّتَيْنِ فَقَطْ 1 .1 - صحيح. رواه مسلم (379). "والترجيع": أي في الشهادتين فيقولها مرة بصوت منخفض، ومرة أخرى بصوت مرتفع.
Narrated Narrated Abu Mahdhura (RA):
The Prophet (ﷺ) taught him the Adhan (call to prayer) and he (the narrator) mentioned the Tarji' in it.
[Muslim reported it, but mentioned the phrase (Takbir) "Allah is the Most Great" at its beginning just twice.
