How can I verify if there was a call to 911 from my phone

My Dad's senior community said he called 911 the other day - he has a flip phone.  When 911 arrived, he had no recollection of calling.  I checked his verizon phone records and the only call he had that moring was to me becuase he was confused why there was an ambulance there.  Do 911 calls not registed in the call history?  If not how can I verify if he really made this call from his cell phone or not?

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