Exemplary voice call payment systems and methods provide parties to a voice call with features for sharing sensitive information over an active voice connection supporting the voice call. An exemplary method includes a voice call payment system detecting, during a voice call between a user of a user device and a representative of a merchant over an active voice connection between the user device and a merchant device of the merchant, a request by the user to submit inaudible payment information to the merchant over the active voice connection as payment in a transaction between the user and the merchant, directing, in response to the request, the user device to acquire the inaudible payment information, and directing, in response to the request, the user device to transmit the inaudible payment information to the merchant device over the active voice connection.