Cisco call manager pub & sub definitions

I'm just beginning to learn Cisco VOIP. Can someone explain to me in a simple way what SUB & PUB mean in relation to Cisco Unity & call manager mean, and how it's used in the real world. My supervisor wants me to do a unity & UCM backup, and I'm not really sure what I'm doing
Thank You very much.

PUB = Publisher
SUB = Subscriber.
In simple terms, think of the Publisher as the manager of the CUCM cluster. Configuration changes are typically done on the Publisher, and it distributes those changes to the Subscribers. Subscribers perform call processing, phone registration, software conference bridge, music on hold, etc., and in some setups the Publisher will as well (depends on size and design, as Jaime mentioned).
The Pub-Sub relation for Unity is a little different... which one handles voicemail traffic depends completely on how the connectivity with CUCM is configured. In some setups, they will be distributed voicemail traffic evenly, while in other setups the Pub may get all traffic until its ports are full, and then overflow to the Sub as a backup.

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