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cisco call manager pub & sub definitions

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Jul 31st, 2014
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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.

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Clay Plaga Thu, 07/31/2014 - 13:33
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I really appreciate the response, but I don't have the slightest idea what your talking about. I'm a total novice in this area. If possible could you restate the response in a way I might be able to understand it. If you can't, I understand.  I will look at the document. Thank You very much.

Jameson Gagnepain Fri, 08/01/2014 - 07:31
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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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