Dec15 Patch causes Missed Call notifications to malfunction

Dec. 8. a security patch for LYNC / Skype for Business was released.

Initially MS released a KB about this patch causing video to stop working when recording meetings.

But it seems this patch also introduced another problem – i have now seen this at a handfull of customer sites – so not all are impacted.

Issue that occurs is that Missed Call Notifications simply stop working, everything is green, so EWS and MAPI status are ok – and it makes no difference if user is enabled for UM.

So far a tested solution is to remove this patch – but being a security patch – this is not really a perfect solution, bug has been submitted to Microsoft.

Issue seems to only occur when both of the following patches are installed

And resolution/ workaround is as follows – this has been tested at 3 different sites, with same effects

Problematic patches are
To make “Missed Call Notifications” work again:
1. Uninstall KB3114351
      2.  Reboot the computer
      4. Uninstall KB3101496
      5.  Reboot the computer
      Test Missed Calls

Happy SKYPE’ing


  1. felix

    trying to solve this issue, i found out the jan 2016 patch KB3114502 causes this problem too! after uninstalling all those KBs (nov15, dec15, jan16) the missing call function was back working in Lync client and I receice missing calls notification in Outlook again.

    some say the jan16 KB is the solution for this issue, ion my case it was the problem. after uninstalling all the KBs you mentioned in your post here (tnx for the hints!), missing calls was still not working until uninstalling jan16 KB too.

    unbelievable they role out this known issue for the third time now..

    hope this hint helps someone tho solve this too! cheers, felix

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