Background Noises on record

I have a file record of a phone conversation that I want to have analyzed.
I want to be able to clearly distinguish background noises and whispers.
Can someone advice how to do it in the most effective way?

The Audacity noise reduction and filtering programs depend on you being able to recognize and manage voices ahead of the game. If you can’t do that, then we’re out. It’s one of the reasons we don’t do surveillance, conflict resolution or law enforcement.