PRonounicing the Adhan twice and Iqamah once

 Anas narrated: ´´Bilal was ordered to pronounce the woriding of Adhan twice (in doubles) and of Iqamah once (in singles) only.´´ Yahya added in his narration from Ibn ´Uaiyah: ´´I mentioned that to Ayyub and he said, ´Except Iqamah (i.e., Qad Qamatis.salat which should be said twice)´.´´