Update that redefines E_UNEXPECTED and E_FAIL errors in Lync 2013 (Skype for Business)

This update includes the following improvements

• Classifies the E_UNEXPECTED error that may occur when a Multipoint Conferencing Unit (MCU) URI isn't available in Microsoft Lync 2013 (Skype for Business) into a separate error category.

• Specifies the E_FAIL error to MEDIA_RELAY_CREDENTIALS_REQUEST_FAILED when an Audio Video Multipoint Conferencing Unit (AVMCU) AddUser Invite fails.

Resolution

To apply these improvements, install the June 7, 2016, update (KB3115033) for Lync 2013 (Skype for Business).

Note Lync 2013 was upgraded to Skype for Business in April 2015.