We are having issues with calls getting dropped when a 7921G phone traverses from a WAP that is connected to Wireless LAN Controller A and transfers to a WAP on Wireless LAN Controller B. This is occurring with both of our 4402WLC and 2106 WLC. We have mobility groups enabled and setup and they can ping the other controllers. There is no problems when traversing from one WAP to another WAP that are associated with the same WLC controller. Any ideas where the problem may be?? I'm trying to find information on configuration settings for this but not much information out there.