Yes, that is the design. The phones will failover to to CCM that is still running for an indefinite period of time. The only thing is if you lose the publisher no changes can be made via ccmadmin. I think it also effects the ability to use cfwdall.
Yes you can have a publisher and subscriber int two different locations depending on the speed of the link.
If you have configured your callmanager groups correctlly then the phones will register with the callmanager that is up at that time. There is no limit to how long the phones will stay registered. They will stay registered with the backup callmanager until the primary callmanager comes back up.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...