300-425 · Question #302
What is the recommended signal threshold for designing a wireless network that supports voice over Wi-Fi (VoWi-Fi)?
The correct answer is B. -67 dBm. Voice over Wi-Fi requires a minimum RSSI threshold of -67 dBm to sustain reliable call quality and low latency.
Question
What is the recommended signal threshold for designing a wireless network that supports voice over Wi-Fi (VoWi-Fi)?
Options
- A-72 dBm
- B-67 dBm
- C-80 dBm
- D-50 dBm
How the community answered
(38 responses)- B95% (36)
- C3% (1)
- D3% (1)
Why each option
Voice over Wi-Fi requires a minimum RSSI threshold of -67 dBm to sustain reliable call quality and low latency.
-72 dBm is the recommended minimum for standard data applications, not voice, which demands a higher signal floor.
A signal of -67 dBm is the industry-standard minimum RSSI for VoWi-Fi deployments, ensuring sufficient SNR to support the low packet loss, jitter, and latency requirements of voice codecs. Cisco wireless design guides and the CWNA body of knowledge both cite -67 dBm as the floor for voice-grade coverage. Designing below this threshold leads to call drops, choppy audio, and roaming failures.
-80 dBm represents only the minimum threshold for basic Wi-Fi association and is far too low to sustain voice quality.
-50 dBm is an excellent signal level but is not the recommended design target - it is unnecessarily conservative and does not define the minimum threshold.
Concept tested: VoWi-Fi minimum RSSI design threshold
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/b_voice_over_wlan_8_8.html
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