The ruling on the mu'adhdhin calling the adhan while sitting

Question:
May Allah reward you with good and do you good. After this, a message reached the program from Hadramawt, and its sender is a listener who says: Alif, Jim, Dal, Abu Mu'adh. Abu Mu'adh says in his question: In our mosque, there is an imam who performs the adhan while he is able to stand. There has been a lot of talk about this issue, with some people supporting it and others not. We ask you to correct us in this matter of ours. May Allah reward you with good.

Answer:
The default ruling for the adhan is that a person should be standing, because this is more effective for the voice, and because this is what the Sunnah has come with. It is permissible for a person to sit and call the adhan while sitting, especially if this is due to an excuse, such as a sick person or one who is bedridden. However, if the situation reaches the point where he is unable to call the adhan while standing, he should appoint someone else to call the adhan until he is able to stand, so that the adhan is performed while standing. If a person reaches a state of continuous inability such that he cannot stand on a continuous basis, he should be replaced by a mu'adhdhin who is able to perform the adhan while standing, unless there is no one else. If there is no one else, there is no harm. In any case, the adhan is valid from a person while he is sitting, but the more preferable and better option is that it be performed while standing, because this is what the Sunnah has come with, and it is more effective for the voice. If a person is unable to stand, he should be replaced by a mu'adhdhin who is able to stand, but if he calls the adhan while sitting, his adhan is valid. Praise be to Allah.