Hi,
There is only one license that is provided for failover systems, and it goes onto the Primary Cisco Unity server. If you open the license file with Notepad, you should see the field LicSecondaryServerIsLicensed is set to Licensed. This helps ensure that you are correctly licensed. Refer to the Installation Guide for your specific release, for instructions on how to install failover. After installation, Configuring Cisco Unity Failover provides additional detail.
As a confirmation, pull up the licensing applet on the Secondary server. It should display the licensing information that is present on the Primary server
so you are right for not ordering 32 ports for the new unity
wish this be helpful
Best Regards