www.newrocktech.com 4-22Step 6 Click Save. The configuration takes effect after the device is restarted.Step 7 To verify your progress, perform the following tasks: After the devices reboot, click Trunk > IP trunk. Verify that the line is registered. You mayneed to refresh the browser screen to see the new status. Use an external phone, such as a cell phone, to place an inbound call to the telephone numberthat was assigned by your ITSP. Assuming that you have left the default settings in place, theAuto Attendant answers the call. You can then dial an extension number to verify that the callrings to the station.4.1.2 Configuring the OM20 for PSTN ConnectivityPublic Switched Telephone Network (PSTN) access is an optional if you have an internet telephone service.You can connect up to four standard analog telephone lines to OM20 depending on the model you purchasedand then configure it so that the users can place and receive calls through the PSTN lines.Follow this procedure:Step 1 Log in to OM20 as Admin accountStep 2 Go to Trunk > Analog trunk to verify if the line connection line status is connected and configurethe actual trunk number.