Q: When the Iqamah is given we are usually silant. When azan is given we reapeat what the Azan caller is saying. Why not for the Iqamah? JAK

A: It is Sunnah to repeat what the Muazzin is saying for the Iqamah, however, when the phrase قد قامت الصلاة is recited, one should say: أقامها الله وأدامها (Which mean May Allah establish the salah and do so continually.)

Allah Certainly Knows Best.

P.S. Reference: الحنفية في الدر المختار: ويجيب الإقامة- ندبا إجماعا -كالأذان- ويقول عند قد قامت الصلاة: أقامها الله وأدامها