This discussion is getting unreal.

Who said the noises meant anything other than Patsy fumbled/had difficulty with/had shaky hands ..... when she replaced the phone.

The noise of Patsy fumbling to hang up the phone is what may be drowing out the other voices on the tape - and why the voices cannot be heard without enhancement.

A whole ridiculous discussion has grown out of my (seemingly) inept description of the 'trying to hang up the phone' sound.