You can add PSTN to the Cisco Webex desk and room devices in your customer organization at any time, such as a Cisco Webex DX80 or a Cisco TelePresence SX10 Quick Set.
Whether they're in the middle of a trial and have access to 10 free PSTN numbers or have been converted to a paid subscription, all you have to do is follow a few steps to enable calling on their devices.
Before you begin
PSTN on Cisco IP phones and Cisco Webex desk and room devices is only available in the United States.
PSTN for Cisco Webex desk and room devices does not require a Cisco Webex Calling license.
From the partner view in https://admin.webex.com, go to customers and select a customer.
Enter the customer's PSTN contract information.
Enter an emergency service address for the customer.
The PSTN service provider instantly validates the address.
Search for and add standard numbers.
Review the order, then click Place Order.
Select Set Up Cisco Webex Service
Customer has to accept the order before you can proceed to the next step.
Follow the steps in the setup wizard for Plan Review, Call Settings (this is where you fill in PSTN information), Message Settings, Enterprise Settings, Add Users, then Finish.