Is it permissible for a mother to listen to an audio recording of a conversation between her young daughter and her father, which includes information about his work and income, and then present this recording to a third party to seek their testimony in a child support case, especially if the mother has no other means to obtain child support?

"It is permissible for some people to listen to recorded calls to ascertain the truth about the husband's salary and to testify in court about what they heard, as long as they are confident in the veracity of what they heard. Many scholars have held that it is permissible to bring witnesses who conceal themselves to listen to an admission from someone who openly denies a right but admits it secretly. Their testimony is acceptable according to the sound narration."