Refer to the exhibit. An engineer has determined that Cisco 7925 phones are roaming between 2.4 6Hz and 5 6Hz radios on the same access points, which results in poor audio performance Which action…

TPCv2 dynamically adjusts AP transmit power to normalize coverage overlap but does not configure the QoS channel-access priorities needed to improve voice traffic quality during band transitions.

EDCA (Enhanced Distributed Channel Access) Voice Optimized parameters tune AIFSN, CWmin, CWmax, and TXOP values so that voice frames receive priority over other traffic on the medium; this directly improves audio quality for the Cisco 7925 by ensuring consistent, low-latency channel access regardless of which radio band the phone is currently using.

Locking the Cisco 7925 to 5 GHz only is a workaround that may create coverage gaps where only 2.4 GHz is available and does not address the underlying QoS parameter issue causing poor audio.

Band Select encourages dual-band clients to prefer 5 GHz during initial association but does not configure QoS parameters that ensure voice traffic receives prioritized channel access for sustained audio quality.