Antonio, If your load on the phone when it registers to 3.3.3 is P003005xxx (notice the 5), then you are already on a signed load and you can go back and forth in signed loads.
If you see that your load is P003003xxx then, you are on an unsigned load. That is when you should be concerned. It will let you go up, but once you go upto a signed load, you will not be able to get back..
It is also worth noting that there are a lot of loads compatible with both 3.3.3 and 4.1.
Your CCM 3.3(3)SR3 is just one step down from the latest SR available for 3.3(3) train. Have they installed any "DevicePacks"? What versions of a firmware do they have?
We upgraded our CCM environment this fall from the 3.3(3) to the 4.1(3), and then installed the SR1 pack. When I simulated this upgrade in the lab, I upgraded whole cluster, and then downgraded it back to 3.3(3) - phones were OK with both operations. So, it shouldn't be a problem. Another thing you may consider - save old firmware files for possible re-use.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...