Skype for Business Web App can't switch audio for a guest user in a meeting with CU5 applied

Applies to: Skype for Business Server 2015

Symptoms


Consider the following scenario:

  • You apply Skype for Business Server 2015 Cumulative Update 5 (CU5) to Microsoft Skype for Business Server 2015 and set the MeetingUxUseCdn to True.
  • You create a Skype meeting and use Skype for Business Web App to join the meeting anonymously.

  • You click the Switch audio to my phone button and then input your phone number.

In this scenario, you can only hear the ringtone when picking up the call.

Cause


Unified Communications Web API (UCWA) doesn't work correctly for this scenario.