I have recently taken over managing a call manager 4.2(3) cluster environment with centralized call control and 30 + sites.
I have a good deal of experience administering a call manager environment and have a good knowledge of dial plans. I don't have a lot of experience with 911 dial plans.
Currently our 911 service is provided by using 911 route patterns with route filters. Each site phone has a unique device CSS to identify the local gateway that the call should be routed out.
My question(s) is
1) If I change the Call Manager media resource group on a sites device pool is there any chance this could affect 911 operations?
2) This is a bit of a broader question, is there any way I could accidentally stop 911 from working by changing anything other the 911 route patterns, route filters, 911 CSS and 911 Partitions?