We have CUCM 7 and a cluster of three Call Manager servers
My understanding is that
When a Cisco phone boots, it gets an IP Address via DHCP and is told which server to register to, once it gets a configuration file.
According to the group shown above, the phone will regsiter to Sub and if it is unavalable or lost, will try SubDR next, then Pub.
What happens if you have a non cisco phone that is configured in call manager to use the above CUCM group, Sub is up and has phones registed to it, but within the config of the non cisco phone, it is forced to Pub (Pub is up) for it's call manager setting?
The phone is pointing to Pub and tries to go there, but call manager says it should be using Sub first.
Should the call be processed because Pub is in the cluster and working, or not processed because the cluster thinks it should be going to Sub first?