Hello experts.
I have an issue with my new 7821 phone deployment they can't register on cisco 2911 CME.
1. I am deploying 7821 phones on CME, when i check ,its version 9.1 and my IOS image on 2911 is c2900-universalk9-mz.SPA.152-4.M6.bin.
2. I also have an attendant console or an extra phone 7861 to as that.
This is what i can work with i could be running myself in EoL or EoS issues i know.
what solution using a compatibly matrix can i get to work with what i have.
What IOS will work with my phones, shipped with active load: sip78xx 12-0-1-11 on Cisco 2900 router what should i do
thanks in advance