Attorney Hopkins provided you with an outstanding answer. Each state has different laws regarding recordings of conversations, in AZ you can do so, what you an do is ask for the full tape so that nothing is taken out of context. then transcribe it yourself or ask for a full copy of the transcription to ptotect yourself.
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If your ex was in Arizona when the phone conversation occurred, then your ex recorded and transcribed it legally. Your ex did not need your consent to make the recording.
You or your attorney could demand that your ex or your ex's attorney disclose the full audio recording so you may obtain a copy and have the entire recording transcribed. If your ex or your ex's attorney refuses to let you obtain a copy of the recording, then you or your attorney could file a motion asking the court to compel your ex to disclose a copy of the full recording.