Call remains ringing on a PSTN phone when you click "End Meeting" in a Skype meeting in Skype for Business Server 2015

Symptoms

Consider the following scenario:

  • You join a Skype meeting in a Microsoft Skype for Business Server 2015 environment.

  • You invite a Public Switched Telephone Network (PSTN) number to the meeting.

  • You click theĀ End Meeting button before the PSTN calleeĀ takes the call.

In this scenario, the call continues to ring on the PSTN phone.

Cause

This issue occurs because the Audio Video Multipoint Conferencing Unit (AVMCU) cannot send the Cancel request to the Mediation Server.

Resolution

To fix this issue, install the May 2017 cumulative update 6.0.9319.281 for Skype for Business Server 2015, Front End server and Edge server.

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