SfB 2015 Server Update – August 2019

Hot on the heels of last month’s CU10 comes CU10 HF1 – the “whoops” fix-up release.

This is build 6.0.9319.562, and it updated three components on my Standard Edition Front-End.

What’s Fixed?

  • 4518680 Can’t transfer external calls by using Polycom VVX phones in Skype for Business Server 2015
  • 4518679 Skype meeting disconnection due to missing session refresh in Skype for Business Server 2015

Note The fix for the following issue is reverted and it is not included in this cumulative update.

  • KB 4507230 Support LBR and branch site voice resiliency conflicting requirements in Skype for Business Server 2015

What’s New?

Nothing noted. No cmdlets have been added to the SfB module in this update.

What’s Changed?

Nothing noted.

Known Issues

After you install the January 2019 cumulative update 6.0.9319.537 (CU8) for Microsoft Skype for Business Server 2015, the Unified Communications Web API (UCWA) applications, such as Skype for Business on Mac, a web application for UCWA, and Skype for Business mobile clients, can’t make a call or join a meeting. For more information, please see the following article:

UCWA client cannot make a call or join a meeting after installing Skype for Business Server update 6.0.9319.537



Here’s the “before” view of it going on to my Lab’s Standard Edition Front-End:


The installer didn’t prompt me to reboot, but I always like to give it one for good measure.

Revision History

2nd September 2019: This is the initial release.

8th September 2019: Added the ‘before’ image.

– G.

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