I'm extremely confused with Cisco IOS versioning system.
We are currently running:
Cisco IOS Software, 3800 Software (C3845-SPSERVICESK9-M), Version 12.4(11)XJ4, RELEASE SOFTWARE (fc2)
on our CallManager Express router.
Any tip to understand and upgrade our system ?
What's the latest version I can use right now ?
I do know how to upgrade routers, I'm only confused about versioning.