Redundant Publishers - Call Manager

[sdawson35]

We have 2 sites on one site we have a publisher and a subscriber on the other site we have a subscriber only. How can I bring a second publisher into the 2nd site in case the primary fails. Extension mobility is paramaount to our operation.

[Brandon Buffin]

You can only have 1 publisher per cluster, so redundancy for extension mobility is not currently possible. Take a look at the following link which says, "Therefore, when the publisher is unavailable, phone updates cannot occur, call forwarding cannot be modified, message-waiting state information will be lost, and Cisco CallManager Extension Mobility stops functioning."

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803eda7f.html#wp1021999

Hope this helps. If so, please rate the post.

Brandon

[Aaron Harrison]

Erm... you can't.

CallManager clusters have a single publisher, and multiple subscribers... And EM relies on the publisher. This is a problem as your publisher may not be available on the 2nd site at some point... however there's not much you can do about it.

An alternative would be to run a seperate cluster at each site, and use a third party product to enable EM between the clusters... one is:

http://www.cisco.com/cdc_content_elements/metreos/products/cluster-mobility.shtml

They're a recent Cisco buy-out so I guess they're doing something right...

Regards

Aaron

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