Non-Judicial Admission

It takes place outside the court.
Non-Judicial Admission is not considered a binding proof for the court, and it is up to the court to assess its value in the evidence.
the non-judicial Admission is proven in accordance with the established general rules, such as that the admission was based on an ordinary bond that includes the imprint or signature of those who issued it.
As for sound recordings, they are not considered evidence and subject to court discretion as being a non-judicial admission. They may be forged, or as a result of coercion, or that the owner of the recording was under anesthetic.