Seems my customer is facing that also and the bug tool mentioned the version CUC.12.5(1.14900.27) has the fix, but this is not available for download on cisco.com (CUC_12.5.1.14900-45)
Anyone can point us to the correct/available version with the fix for 12.5.1.x?
Known Fixed Releases: (8)
CUC.14.0(0.97000.642)
CUC.14.0(0.97000.589)
CUC.14.0(0.96100.13)
CUC.12.5(1.14900.27)
14.0(0.264)
14.0(0.243)
12.5(1.225)
12.5(1)ES22