Is it permissible to say the iqaamah for prayer sitting when he is able to stand?

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Check below answers in case you are looking for other related questions:
Adhaan and Iqaamah when praying alone
Is using loudspeakers for the adhaan an innovation (bid’ah)?

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Modulation and elongation of vowels in the Adhaan
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The reward for the muezzin and the one who gives the iqaamah
Adhaan and Iqaamah when praying alone
Is using loudspeakers for the adhaan an innovation (bid’ah)?

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