I had the same issue and after research, I find there might be 2 reasons :
1. Bug : Please refer This Link -- The upgrade might have been completed , you may go ahead reboot the server , check the version and switch version as needed -- this is a Bug : CSCuu34496.
2. OVA profile is not match -- version 11.5 require larger vRAM. This reflected on switch over, will pop out with error. After expend the vRAMo from Esxi, you should be able to switch over to the new version.
After resolved these 2 issues , I was able to complete the upgrade successfully !! :)
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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