All, I am up for a few CallManager upgrades. I am still somewhat new to IP Telephony, so I was wondering if someone could tell me how long a typical upgrade might take? Im upgrading from 4.0(2) to probably 4.1(3). Anyone have any ideas?
Also, If I am upgrading a cluster of 2 CallManagers, would I do the publisher first, reboot it, bring it back online, and then take down the subscriber and upgrade it?
Also, would I take them "offline" before upgrading them?
All, thanks for your patients with me and your time in answering.