I have Cisco CCME network installed with Cisco IP Phone 7940, 7936 and 7912. It is working fine. Recently, I bought a Cisco IP Phone 7911 due to 7912 obsolete and having problem using 7911 phone on my VOIP network.
I have tried to upload 7911 firmware to CCME router but still not working. I am not able to find 7911 from command telephony-service
load 7911 SCCP11.8-3-1S
So, I used 7910 for this.