MWI is not working intermittently

[Safdar Azizi]

Issue description:
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• MWI is not working intermittently and for few users.Other phones are working fine.
• Issue started happening from the time we have upgrade our CUC 8.x to CUC 8.5.1ES148.17133-148.
• Issue has been repeated in a month for few users.
• Please suggest .

Details
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• Phone Model:Cisco 7931
• Phone Load :SCCP31.9-3-1SR1-1S
• CUCM ver:7.1.5.35901-1
• CUC ver:Version 8.5.1ES148.17133-148
• SCCP integration of CUCM to CUC.

Troubleshooting done:
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• Cheked Voicemail CSS and it has access to voceimail PT
• Tried dialing MWI ON 1500 and MWI OFF 1501 ,No success.
• Reset Connection Notifier service , no luck.
• Already checked steps suggeseted in this post:https://supportforums.cisco.com/document/113341/message-waiting-indicator-mwi-not-working-cisco-unity-connection

[Safdar Azizi]

We have recreated the user in CUC which resolved the issue.