When agent anonymity is enabled on the workflow in a response group in Microsoft Skype for Business Server 2019 or Skype for Business Server 2015, the agent is unable to transfer an incoming PSTN call to another PSTN user.


This issue occurs because the transfer request to PSTN gateway doesn't have any telephone number in the DID range. Thus PSTN carrier blocks the outgoing call.


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

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