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No, I'm saying they obtained complete phone calls that were made at times before they knew the phone numbers corresponded to terrorist activity. There's only one way to do that, and that's that the call was recorded without knowing it was suspicious. There are several governments involved, any of whom could have recorded it, but it entails recording internet traffic in high volume (since it was VoIP).
Somewhere, whole VoIP phone calls, caller data, voice communications, and packet and routing identifiers, exist in a storage medium. It's the only way, except in the movie Déjà Vu, where they can bend space by causing power blackouts. Anyone want to bet it's near New Jersey? And how convincing this will sound to Mr. Obama?