Phone Call Participants Identification System -- 2

I am seeking a highly skilled expert to identify two different people on a phone call in multiple language. This system should be able to accurately identify each unique person's voice on the call, with an accuracy level of nearly perfect (95%-100%). This is for a court case

Key skills and experience required:
- Proficiency in voice recognition technology.
- Extensive experience in audio file analysis.
- Proven capability in creating high precision identification systems.

This project demands close attention to detail and a robust understanding of voice frequencies and distinguishing characteristics.

How long of the voice recording do you require to complete this type of examination?