Iqama

Iqamah is an Arabic word that refers to the second call for the prayer which follows the first call (Adhan). Iqamah means that the prayer is ready to start. For both men and women it is mustahabb (recommended) to recite iqamah before every daily obligatory salat (prayer), with the salat immediately following it.
The rules applicable to adhan, such as continuity, sequence, its being in Arabic, etc., apply to iqamah as well.

Iqamah according to Five Islamic Schools of Law

.Allahu akbar (God is Greatest); twice according to all the schools except the Hanafis who require itfourtimes

.Ashhadu an la ilaha illallah (I bear witness that there is no God but God); once according to the Shafi'is, Malikis and Hanbalis and twice according to the Hanafis and Imamis
.Ashhadu anna Muhammadan Rasulullah (I bear witness that Muhammad is His Messenger); once in the opinion of the Shafi'is, Malikis and Hanbalis, and twice according to the Hanafis and Imamis
.Ash hadu anna Amiral Mu'minina 'Aliyyan Waliyyullah(I testify that the Commander of the faithful, Imam Ali is the vicegerent of Allah) which is not a part of either Adhan or Iqamah. But according to Imamis (Shi'ites) it is preferable to be pronounced twice after Ash hadu anna Muhammadan Rasulul lah
.Hayya 'ala as-salat (Come to the prayer); once in the opinion of the Shafi'is, Malikis and Hanbalis, and twice according to the Hanafis and Imamis
.Hayya 'ala al-falah (Come to Salvation); once in the opinion of the Shafi'is, Malikis and Hanbalis, and twice according to the Hanafis and Imamis
.Hayya'ala khayr il-'amal (Come to the best act); twice only according to the Imamis
.Qad qamat is-salat(The Prayer has begun); twice in the opinion of all schools, except The Malikis who recite it once
.Allahu akbar(God is Greatest); twice in the opinion of all the schools
.La ilaha illallah (There is no god but God); once in the opinion of all the schools

.A group of Imami legists observe: It is valid for a 'traveler' and a person in a hurry to recite each sentence of the Adhan & Iqama only once
:Taken from
'Allamah Muhammad Jawad Maghniyyah: al-islam.org
http://www.usc.edu
http://suficenter.org
http://www.islamicacademy.org