1. A method for providing a remote voice interface with a supervisory control and data acquisition system, the method comprising: by a human-machine interface telephone gateway, receiving from a cloud telephone service a text command identifying an element of the supervisory control and data acquisition system and an action to be performed, the text command being derived from an audio voice command received by the cloud telephone service from a human operator; transmitting, via an application interface with the supervisory control and data acquisition system, a system command based on the text command, after receiving a text approval in response to an approval request via a conference call; receiving, from the supervisory control and data acquisition system, a confirmation message in response to the system command; and transmitting, to the cloud telephone service, text for conversion to an audio message reporting the confirmation message to the human operator.
1. A method for providing a remote voice interface with a supervisory control and data acquisition system, the method comprising: by a human-machine interface telephone gateway, receiving from a cloud telephone service a text command identifying an element of the supervisory control and data acquisition system and an action to be performed, the text command being derived from an audio voice command received by the cloud telephone service from a human operator; transmitting, via an application interface with the supervisory control and data acquisition system, a system command based on the text command, after receiving a text approval in response to an approval request via a conference call; receiving, from the supervisory control and data acquisition system, a confirmation message in response to the system command; and transmitting, to the cloud telephone service, text for conversion to an audio message reporting the confirmation message to the human operator. 8. A method as in claim 1 , wherein the audio voice command is an audio command to take action, the system command is an action request, the confirmation message contains a confirmation that the supervisory control and data acquisition system took the requested action and the audio message reports the confirmation.