You have a VoWLAN configured for platinum QoS, WMM, and CAC. IP phones for this VoWLAN include the Nokia and Cisco Unified Wireless IP Phones 7920G (pre-v2.0 firmware), 7921G, and 7925G. The Wireless IP Phones 7921G and 7925G work properly, but the Nokia and the Wireless IP Phones 7920G associate with the WLAN but cannot place calls. What is the issue?

You have a VoWLAN configured for platinum QoS, WMM, and CAC. IP phones for this VoWLAN include the Nokia and Cisco Unified Wireless IP Phones 7920G (pre-v2.0 firmware), 7921G, and 7925G. The Wireless IP Phones 7921G and 7925G work properly, but the Nokia and the Wireless IP Phones 7920G associate with the WLAN but cannot place calls. What is the issue?
A . The lowest mandatory speed in the WLAN is too high and needs to be reduced.
B . The Cisco Unified Wireless IP Phones 7920G and Nokia IP phones do not support TSPE
D . EDCA needs to be enabled on the WLA
F . HCCA needs to be enabled on the WLA
H . The reserved roaming bandwidth setting is set too low.
. The expedited bandwidth setting needs to be enabled.

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Answer: B