Conference call dropped after 28 or 56 minutes joining from Cisco phone in Skype for Business Server 2015

Applies to: Skype for Business Server 2015

Symptoms


In Microsoft Skype for Business Server 2015, when you have a conference call with a user who joins the call by using a Cisco phone, the call will be unexpectedly disconnected after 28 or 56 minutes.

Resolution


To fix this issue, install the May 2020 cumulative update 6.0.9319.580 for Skype for Business Server 2015 and Unified Communications Managed API 5.0 Runtime.

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