VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones 7920G and 7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. What would be the most…

Client CAC is not supported by the 7920G, which requires the AP to perform admission control on its behalf; WMM = Disabled also blocks 7925G from using WMM-based QoS.

The 7920G requires AP-based CAC for admission control because it does not perform client-initiated TSPEC; setting WMM to Allowed permits the WMM-capable 7925G to use QoS while still allowing the non-WMM 7920G to associate on the same SSID. Radio Policy = All ensures both 2.4 GHz and 5 GHz are available to all device types throughout the migration.

Client CAC is incompatible with the 7920G, and restricting Radio Policy to 802.11a only excludes the 2.4 GHz band the 7920G may depend on.

Radio Policy = 802.11a only excludes 2.4 GHz support required by the 7920G, making this configuration incompatible during the mixed-device migration phase.

Client CAC is not supported by the 7920G, WMM = Disabled prevents 7925G from using WMM QoS, and 802.11b/g only eliminates 5 GHz band access for the 7925G.

Radio Policy = 802.11b/g only locks all phones to 2.4 GHz, preventing the 7925G from leveraging the less congested 5 GHz band for optimal voice quality.