The ruling on a woman speaking with her sister's husband

Question:
May Allah reward you with good, and may He do you good. A listener, your sister in Allah, Umm Suhayb, says: I sent a message containing a collection of questions. In one of them, she asks and says: What is the ruling in the Shari'ah regarding a married woman speaking with her sister's husband on the phone, such as responding to him and asking about her sister's condition, the children's condition, and asking him about matters like greeting the husband if he is not present? Also, if there is a problem between this husband and his wife, and he wishes at that time to contribute to resolving it? May Allah reward you with good.

Answer:
Is it a man who is speaking, or a woman? A woman: there is nothing wrong with her speaking to her sister's husband and greeting him on the phone or otherwise, and asking about his health, about her sister, and about what she needs. This is not of the forbidden calls, because it is a call for a need, on the condition that nothing enters into it that gives the man hope, such as joking or what they call flirting. These are reprehensible matters and are not permissible. As for a call for a need, with known speech, there is nothing wrong with it. Yes.