Symptoms
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.
Cause
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.
Resolution
To fix this issue, install one of the following updates:
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The September 2020 cumulative update 7.0.2046.244 for Skype for Business Server 2019, Response Group Service.
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The May 2020 cumulative update 6.0.9319.580 for Skype for Business Server 2015, Response Group Service.
