Room Phone License is an add-on to enable the phone calling feature. You can purchase as many Room Phone Line add-ons as you have Room Licenses since a Room License is needed to add rooms.
Sign in to your RingCentral online account.
Go to Billing > Purchase > Rooms Licenses.
Click Room Phone Lines.
Select the country from the dropdown, enter the number of licenses, and click Add to Cart.
Click Check Out, review the details of your purchase, and click Next.
Under Review Order, tick the checkbox to acknowledge your purchase and click Next.
Review your purchase statement, then click Done.
Reserving and assigning a phone number to Rooms
Go to Phone system > Phone numbers > Number Inventory and click Reserve Numbers.
Choose the target country and state, then reserve the number for your room.
Go to Meetings > RingCentral Video > Rooms > Rooms List.
Choose the room where you want to assign the phone number.
Under the Phone Line tab, click Add Room Phone Line.
Click Select under Phone Number, then choose the number you want to assign.
Enter the Emergency Response Location information.
Click Add.
Note: Enabling a Room Phone Line will consume a Room Phone License from your inventory.