Web Client needs to gracefully handle different client firewall configurations.
When a web client joins a meeting, we many times are dealing with situations where the client is behind firewalls or has other security or policy restrictions. The Skype web client needs to gracefully detect and give the users the options to keep the best experience. If only port 443 is available, don't just break, but possibly show the content and recommend they dial-into the meeting for audio. Way to often we have our staff moving away from Skype for Business for collaboration to GoTo Meeting, Zoom, Webex or some other solution which just works in situations where Skype fails.
Fredrik Åsvik commented
This should include also the ability to run a temporary client when not able to do installs on the machine joining the call. This is possible in Webex but not in SkypefB.