When the PreventPSTNTollBypass parameter in voice policy is set to true and the AllowNonEnterpriseVoiceUsersToDialOut parameter in conferencing policy is set to false in a Microsoft Skype For Business Server 2019 or Skype for Business Server 2015 environment, users who’re not enabled for Enterprise Voice unexpectedly can dial out from a conference.


To fix this issue, install one of the following updates:

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