Description: This attribute displays the operational mode of every time slot which is serviced by a voice service. The value idle means that the time slot is not used to service a call, hence the concerned voice service's bandwidth in the Passport subnet is available for other uses. The value voice means that a phone call is in progress. All provisioned voice service's value added features have been activated (features such as voice compression, silence suppression, echo cancellation). The value data means that a data call is in progress. All provisioned voice service's value added features have been de-activated, so that a clear 64 kbit/sec data connection is provided accross the Passport subnet.