Description: It is used to maintain PSTN ports with the VSP feature. The index of this table is hwPstnCTPOperIndex. Through the table, you can query the states of PSTN ports, including the running status of the PSTN service, management status of the PSTN service, change time of the running status of the PSTN service, and change time of the management status of the PSTN service. Through the table, services on the PSTN port can be terminated, started, and the service status can be queried.