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How does a phone know to register with the Cisco Unified PhoneProxy secondary node if the primary node is down?

April 26, 2017cisco unified phoneproxy Node phone primary REGISTER Secondary

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How does a phone know to register with the Cisco Unified PhoneProxy secondary node if the primary node is down?

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A. The heartbeat function for each phone is called every 30 seconds. When they miss a beat, the phone registers with the secondary node and then attempts to register again with the primary node.