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Business Edition 6000 runs on a UCS C200 Rack-Mount Server acting as a combined publisher and single subscriber instance. A second UCS C200 server can be deployed to provide call processing redundancy by means of a secondary subscriber. Alternatively an MCS server can be used to provide redundancy.
This is explained in the SRND
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/callpros.html#wp1159144
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
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