It looks like there's an issue with the ISO file
2012-01-28T10:44:59.408Z| vcpu-0| CDROM: Connecting ide1:0 to '/vmfs/volumes/4f23c632-b6d5f29e-70b0-000c2947a8c1/cucmiso/UCSInstall_UCOS_UNRST_8.5.1.12900-7.sgn.iso'. img=1 raw=0 remote=0
2012-01-28T10:44:59.420Z| vcpu-0| DMG_Open: Not an unencrypted .dmg file (footer signature 0x00000000).
2012-01-28T10:44:59.420Z| vcpu-0| DMG_Close: max cached entries 8
To verify whether it's the ISO or anything else, try to boot the VM from another ISO (e.g. http://gparted.sourceforge.net/download.php).
André