upgradation of cucm from 4.0 to 8.0

[dinesh joshi]

Hi,

We are planinng to upgrade cucm 4.0 (having three cluster) to 8.0. We have query regarding dlu, can we use same dlu with 8.0 or we need to purchase new dlu.

Please suggest me if any document is there  on the same.

Regards,

Dinesh Joshi

[Gajanan Pande]

Dinesh,

Checkout https://supportforums.cisco.com/message/3557552#3557552

There are many many more threads available on this forum for same topic, so it's always best practice to search for old threads before posting new.

GP.

Pls rate helpful posts !!

[Jean Lofrano]

Hi Dinesh!

In sumary, you need to change the MCS server for a new server with compatibility of the hardware and software.

You need also, to do a list of the all ip phone models and to migrate all licenses for the new version..

You can to send a email for license@cisco.com

thanks,