Symptoms
In a Microsoft Skype for Business Server 2019 or Skype for Business Server 2015 environment, consider the following scenarios after you configure User A for Location-Based Routing (LBR):
Scenario 1:
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User A signs out of all clients.
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User B makes an inbound PSTN call to User A.
Scenario 2:
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User A sets up call forwarding to send all calls to voice mail.
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User A then signs out of all clients.
Scenario 3:
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User A sets up call forwarding to an external mobile phone number.
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User A then signs out of all clients.
In all scenarios, an inbound call will hear a fast busy. The caller isn't routed to voice mail or not forwarded to the external number.
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business Server 2019, install the December 2019 cumulative update 7.0.2046.151 for Skype for Business Server 2019, Front End Server and Edge Server.
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For Skype for Business Server 2015, install the May 2020 cumulative update 6.0.9319.580 for Skype for Business Server 2015, Front End Server and Edge Server.
