bUG CSCtt38270: 7925 sometimes takes 1+ second to respond to WPA M1 key message

Heads up if you're having wireless voice issues with 7925 handsets with WPA2/PSK. Problems with roaming, gap in voice bug.

7925 sometimes takes 1+ second to respond to WPA M1 key message

Symptom: A wireless phone call may experience a voice gap of 1.5 - 2 seconds when it roams if using WPA2-PSK. Conditions: 7925G is configured to use WPA2/AES PSK. Workaround: Configure some key management method to avoid performing a full WPA2 key exchange at each roam time. For example, EAP with CCKM, or static WEP. If using PSK, then reducing the WPA key retransmission timeout (e.g., on a WLC, via "config advanced eap eapol-key-timeout 250", may ameliorate the problem somewhat (e.g. bring the outage duration down from 2.5 to 1.7 seconds.) 1.4.3ES.1 containing the fix for CSCtz48689 may be helpful as well. Further Problem Description: A wireless packet capture, or a "debug client" on the WLC, will show that the WLC/AP transmit the M1 key message to the phone (and the capture shows that the phone ACKs it), but the phone does not send its M2 key. So the WLC/AP have to retransmit the M1 key, till finally the phone responds.

Status   Terminated  Severity   3 - moderate  Last Modified   In Last 2 weeks  Product   Cisco Unified IP Phone 7900 Series  Technology   Wireless, Mobile  1st Found-In   1.4(2) 1.4(1.1.1.7)