*edit: Adding some additional information.
Cisco 5508 WLC, 2600 and 3500 series APs.
Vocera B3000N badges as the wireless client
Calls between Vocera and the PBX via a SIP gateway experience duplicate packets in the direction of badge to PBX.
Vocera badge to other vocera badge has no issue. It is possible that other traffic is duplicated by this bug but the only place we're experiencing it is in this particular VOIP traffic flow.
Does not occur on 8.0.152.10, but does occur on versions:
8.3.150.0
8.5.140.0
8.5.151.5