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What are the requirements for signal strength and quality (from the access point) for optimum voice quality on the Cisco Unified Wireless IP Phone 7920?

April 26, 2017cisco unified optimum point quality requirements signal strength Voice Wireless

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What are the requirements for signal strength and quality (from the access point) for optimum voice quality on the Cisco Unified Wireless IP Phone 7920?

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A. Cisco recommends that the relative signal strength (RSSI) be equal to or higher than 20, which is around -90 dBm. Also Channel Utilization (CU) should not be higher than 45 (requires QoS Basis Service Set (QBSS) to be enabled on the access point).