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Odd Cisco PoE Switch Reset

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there are some instances where the phones would switch to a secondary call manager host, so I would look carefully to make sure that somehow the phones think the primary CM is offline, and are all dropping to connect to a secondary CM.

With respect to POE, if this issue was isolated to one switch I would wonder if it's power supply was going bad, but if POE is actually dropping on more than one, that sounds like one of those weird and wonderful Cisco bugs to me....