Is it mandatory to have the Software Support service on the phones registered on a CUCM?
and what happens if you do not have Cisco Software Support Service on all device licenses in CUCM?
(what rights do you lose)
All my License type is of course in compliance in my PLM
You need Software support service [SWSS] while doing major upgrades say from CUCM 10 to 11. So, once you do major upgrades , you need to have user licenses for that upgraded version.
Suppose before up gradation you have 100 CUWL standard licenses and SWSS for 80 . After, you do upgrade, only 80 phones with 80 CUWL licenses would be working .
Also, while placing the order , you could mention only 80 to be ordered.