In a scneario of Publisher & Subscriber......if say all the phone are registered with Subscriber and Subscriber Goes down so what is the effect on IP Phones or will all features work properly.
In a two server environment, so long as you have your CM groups configured with the subscriber first and publisher second, should the subscriber go down for whatever reason, phones and other devices should register with the Publisher.
There is a section in the UC SRND which discusses this in detail:
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