"Q. Can you hear any effort on the tape to try to hang the phone up, a banging or a tapping or anything of that nature?
A. The call obviously concludes with the line disconnecting but, no, not that I recall today without listening to the tape of the phone banging."

Without proper punctuation or a chance to listen to the audio this can either mean the phone did bang or it didn't.

For example:
"Q. Can you hear any effort on the tape to try to hang the phone up, a banging or a tapping or anything of that nature?
A. The call obviously concludes with the line disconnecting but, no, not that I recall ...of the phone banging."

OR

"Q. Can you hear any effort on the tape to try to hang the phone up, a banging or a tapping or anything of that nature?
A. The call obviously concludes with the line disconnecting but... not that I recall ...without listening to the tape of the phone banging."

Within the context of the question I'd say it was the first interpretation.