What is the ruling on the iqaamah when someone is saying hayya alassalaat instead of saying salaah or salati (and then continue)?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.

When the person saying the iqaamah (second and final call to prayer) recites "Hayy ʻala As-Salah" (meaning come to prayer) with a taa' marbootah at the end (pronounced salat instead of salah), this is considered lahn (i.e. incorrect recitation due to mispronunciation of letters or grammatical mistakes); however, it does not render the iqaamah invalid because such a mistake does not change the meaning. The same rulings applying to the athaan (call to prayer) in this regard apply to the iqaamah as well. Ibn Qudaamah wrote, "The iqaamah is considered one of the two athaans." [Al-Mughni]

Muslim jurists underlined that the lahn made while calling the athaan does not invalidate it as long as it does not alter the meaning. The Hanbali scholar Ar-Ruhaybaani wrote: "The lahn or speech defect that changes the meaning invalidates the athaan."

It should be noted that saying the iqaamah is not a condition for the validity of the prayer. Even if we assumed that the iqaamah is invalidated due to the lahn or that the praying persons did not say it to begin with, the prayer is still valid. Ibn Qudaamah said:

"If a person performs the prayer without saying the athaan or iqaamah, then the prayer is valid according to the two scholarly views reported in this regard. This is supported by the report narrated on the authority of Al-Aswad and ʻAlqamah (), who said, 'We went to the house of ʻAbdullaah (ibn Masʻood) and he led us in the prayer without athaan or iqaamah.' This report was cited by Al-Athram. I do not know any scholar who disputes this opinion save  for ʻAtaa', who held that when the praying person forgets to say the iqaamah, he should repeat his prayer. Al-Awzaaʻi once said that such a praying person must repeat the prayer as long as the time of the prayer has not expired. If the prayer's time has expired, then he should not repeat it. However, this view is odd and the view adopted by the majority of scholars is the most correct in this regard ..." [Al-Mughni]

Allaah knows best.