Symptoms

In Microsoft Skype for Business Server 2019 or 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 one of the following updates:


Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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