CUCM 12.5 uses smart licensing. starter bundle is a promotional package for BE6K. for CUCM its just license(CUWl,ENH+,ENH,BASCI,ESS).
all your license will be deposited on your smart account. you just need to register the CUCM instance with smart account and that will not affect any services.
Smart license can be done using direct method and using satellite. you will get more informations from below link.