context: We had an emergency and needed to get help, so I decided I called 911. First I picked up the receiver to the phone and paste it to my ear to listen for a doubts home. Once I was sure that I heard the dial tone waiting for me to doubt a number, I pushed the number button labeled with the number 9 on the keypad, then I press the button with the number one on it  two times. I held the phone next to my ear and mouth, as I listened to the phone ring one time. He merely after that ring, the operator who worked as a dispatcher for the emergency center I was calling answered the phone on the other in, asking me what my emergency was. Speaking through the speaker piece of the telephone, I explained that we had an emergency and needed an ambulance to respond to our location immediately.
question: Who called 911?
reference: The person telling the story.
candidate: Speaker