We have a current user of CUCM 4.3 who is planning to upgrade their system into version 8. I read all ordering guide for version 8, but it seems that there is no direct path in this kind of migration or upgrade. Since our approach is to provide them with new server but reuse existing phones, my question is how they can benefit in their current phone licenses if applicable. Unlike in 7.1 where you can apply for the equivalent DLUs based on the P.O. or documents of the phones to used it in the new system. Please advise if there is a better way. I’m planning to upgrade them first to 7.1 then enrol them in the 3 on 3 promo maybe a year after to take them into version 8.