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Cisco 99xx-series power requirements

The 9971 and 9951-series phones are class 4 (802.3at) rated, which means they will/can require more than 15.4w for operation.  My question - if they are connected to a PoE port that can only provide class 3 (802.3af) power, will you be still be able to place audio calls?   Basically, is the 802.3at-level power only required when making video calls?

Thank you

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