Resolved! "Best" 15.x IOS to use with UC-CUCM8.6
I had a question regarding IOS version (ISR1 and 2’s)… We will be adding memory to our current ISR1’s, to support 15.x as we move to CUCM 8.6. getting the ISR1’s on 15 will extend the life on them until we are able to replace them with ISR2’s in th...