URL call is disabled?

My company moved to a new address last year and we just hooked up one of the old phones that hadn't been used during that time. It shows the correct date and time but the phone icon at the date/time screen is hollow, there's no dial tone, and trying to dial anything shows a message of 'URL Call is Disabled'.  I tried to contact Support via phone to have this corrected, but the AI thought I was trying to pay a bill and wouldn't route me to tech support or give me a human.