Can I Use the Endpoint to Place PSTN Calls

Yes. Perform the following steps:

Step 1 Insert a PSTN interface card into the back of the endpoint.

Step 2 When the green indicator turns on, connect a PSTN cable to the endpoint and power on the endpoint.
Step 3 Press  on the remote control to display the Call screen.

Step 4 On the Call screen, set Line type to PSTN and Site name/IP address/Number to the phone number you want to dial, and select Call.