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We also had the same issue on a 9.x cluster. Restarting the Cisco Tomcat service on both UCCX servers in the cluster, as well as the PUB and SUBs in the CUCM cluster, fixed the issue for us.
Hi Cynthia, i'm not sure if you ever received any feed back regarding this issue or not. We have a similar infrastructure, and have also experienced the same MWI issue between Call Pilot and Cisco phones. In the past, a reboot of the Voice Gateways...