We have IPCC 4.05a.
To use IPPA in an HA environment will I need to create 2 IP services in CAll Mgr.? 1 service pointing to each server?
Or is there a service that can be used that will try server A then server B?
You are correct, you will need to create two IP Phone Services within Call Manager; 1 service pointing to each UCCX server.
I have seen some attempts to use DNS or server load balancing to get around this; however, at the end of the day configuring two services seems to work the best.