Well, I think you've gotten good ideas; however, it helps to have all the details when you post to the forum. Saying upfront that ALL 7940's did not register would have changed the scope of what the problem actually is. So, with that said - here are some key points for you to consider:
1) Did you test the firmware upgrade on a 7940 from your environment before doing the upgrade? At this point, it's a moot point but I'd highly recommend doing the firmware upgrade independent of the CUCM upgrade whenever possible.
2) Are you phones spinning - i.e., are the 7940's constantly reattempting to register or are they stuck in a failed upgrade state? In either case, you CANNOT restart or reset a phone from the CUCM admin page if it is not registered. If the phone isn't registered, it will not respond to SCCP request from the CUCM. However, if they are spinning then you should be able to load a downgraded firmware and the phones MIGHT try to pull the upgrade firmware file without a power cycle. I say MIGHT because phones act strangely sometimes when there is a firmware issue at play.
3) If the phones are stuck from a failed upgrade in firmware, then you are going to need to power cycle the phones in one of 2 ways: manually disconnecting/reconnecting every phone after you load the downgraded firmware version OR writing a script to shut/no shut the switch port that each phone is connected to (this is the same as a hard disconnect since it shuts off PoE to the port). You'd need to shut the port, wait a few seconds, and the enable the port to make sure the phones fully disconnect before proceeding.
You could also use a TFTP client on your local PC to spoof a TFTP request to the CUCM and take a look at the file that is being sent to the phone. Check the details to see if there are any obvious issues with the TFTP files for the 7940's.
In addition, it would probably be wise to test your "downgrade" theory by loading the downgraded version of firmware and then manually setting a single 7940 to boot using this firmware. You can do this from the Device configuration page for any phone. Set the Phone Load version to the downgrade version, power cycle the phone, and see if it comes up. If it does not, then you may very well have issues elsewhere within the CUCM application and not just with the firmware itself. If that is the case, you'd be best off to take this up in a TAC case and get specialized help with someone who can remotely access your network.
Hailey
Please rate helpful posts!
