Maaseh Rav Siman 47
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
קדיש וקדושה ואמן יכול לענות כששומע מבית לבית אפי' כשיש הפסק דבר שנזכר בש"ע (סי' נה סעי' כ') כיון שאינו רואה:
Sefaria Community Translation
One is able to respond to Kadesh, Kedusha, and Amen when one hears (the prayer) from house to house, even when there is a physical barrier in the way as brought up in Shulchan Aruch (55:20), (when it discusses responding to blessings) despite being unable to see (the person making the blessing).