An engineer finishes configuring a voice over wireless deployment. However, during the testing phase, the 7925 series phones are not able to complete calls and display Network Busy. CAC has been configured for the wireless system. What action should the engineer take next to troubleshoot the issue?
A. ensure the lowest data rate is 12Mbps and set to Mandatory, and verify there is enough allocated bandwidth to support voice calls
B. check that the lowest data rate is 5.5Mbps to support TSPEC, and verify that the SSID is set to Platinum
C. modify the SIP CAC Access Control List on the controller to permit voice traffic for 7925 phones
D. turn off traffic stream metrics
