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Symptoms 

When Unified Messaging (UM) is enabled, you can't edit the calling rules and you receive the following error message: 

"The server EXHR-01599.EXCHRSV.contoso.com returned an invalid response message. Error 0xe0434352 (Unknown error (0xe0434352)) from EXHR-01599.EXHR 01599.EXCHRSV.contoso.com(IUMPlayOnPhone.ExecutePoPRequest)."

Resolution 

 To fix this issue, install the following security update, as appropriate:

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