What are the minimum requirements to operate cisco 7925 wireless phone?

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1. Prefer 5 GHz coverage for voice applications due to the lower noise floor compared to 2.4 GHz
   Verify an AP can be seen from the phone at -67 dBm or better in all areas to be covered
   Verify that the AP sees the phone at -67 dBm or better in all areas as well
   Signal to Noise Ratio should always 25 dB or more in all areas to provide coverage for Voice applications
   Channel utilization should be under 50%

   https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MR_Wireless/Wireless_VoIP_QoS_Best_Practices

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