den athan laut aussprechen ist nach der fatwa (s.u.) erwünscht, aber keine pflicht
die iqaamah ist bei jedem gebet pflicht
die hadith unten ist oben bei der schwester in deutsch gepostet

athan:
Allaahu akbar, Allaah akbar, Allaahu akbar, Allaah akbar; ash-hadu an laa ilaah ill-Allaah, ash-hadu an laa ilaah ill-Allaah; ash-hadu anna Muhammadan rasool-Allaah, ash-hadu anna Muhammadan rasool-Allaah; hayya ala al-salaah, hayya ala al-salaah; hayya alal-falaah, hayya alal-falaah; Allaahu akbar, Allaahu akbar; Laa ilaaha ill-Allaah

iqaamah:
Allaahu akbar, Allaah akbar; ash-hadu an laa ilaah ill-Allaah; ash-hadu anna Muhammadan rasool-Allaah; hayya ala al-salaah, hayya alal-falaah; qad qaamat il-salaah, qad qaamat il-salaah Allaahu akbar, Allaahu akbar; Laa ilaaha ill-Allaah


It is permissible for a person praying alone to pray without the Adhaan, but if he is in the desert or on a remote farm and the like, it is prescribed for him to recite the Adhaan even if he is going to pray alone, and the Iqaamah is prescribed at all times, because of the general meaning of the evidence, and because Abu Saeed al-Khudri said to Abd-Allaah al-Ansaari: see that you like sheep and the wilderness. When you are with your sheep in your wilderness, and you recite the Adhaan for your prayers, raise your voice, for no jinn or man or anything within the voice range of the muezzin hears the call, but will bear witness for him on the Day of Resurrection. Abu Saeed said: I heard this from the Messenger of Allaah (peace and blessings of Allaah be upon him).

http://www.islam-qa.com/en/ref/6130/athan