Can we convert our existing CUCM licenses to Webex Calling licenses, or do we have to purchase new licenses? We would appreciate more details. Do Webex Attendant Consoles require any special licenses?

Existing solution with CUCM integrated with ISR 4451/4331/4351 for local gateways with PRI. Does this gateways  necessary any additional license for work as local gateway with webex calling, like voice with security for ISR and any additional webex c...