A gaming system includes logic circuitry and a gaming machine for conducting a casino wagering game. The logic circuitry receives, via an acoustic input component of the gaming machine, an acoustic capture signal representative of a player account identifier corresponding to a player account from a mobile device, determines the player account identifier represented by the capture signal, and associates a gaming session on the gaming machine with the corresponding player account. In addition, the logic circuitry, in response to receiving in a prescribed manner, via the acoustic input component, an acoustic maintain-session signal from the mobile device, maintains the association between the gaming session on the gaming machine and the corresponding player account for a period of time, In response to failing to receive the maintain-session signal in the prescribed manner, the logic circuitry terminates the association between the gaming session and the corresponding player account.
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